The enthalpy of the following chemical equation is -393.5+(-296.8)+87.9=-602.4 kilojoules.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Mendel described the parents he crossed to make his first generation of pea plants as being pure of each trait. Today we use the term homozygous instead of pure. Mendels first generation pea plays with purple flowers has which set of alleles
A. The alleles for flowers and the alleles for color
B. Two alleles for purple flowers
C. One allele for purple flowers and one allele for white flowers
D. Two alleles for white flowers
Mendel's first generation pea plants with purple flowers would have had two alleles for flower color.
What is alleles?Alleles are different versions or variants of a gene that occupy the same position, or locus, on a chromosome. Each individual inherits two alleles for each gene, one from each parent, which can be either the same (homozygous) or different (heterozygous). These alleles can have different effects on the organism's phenotype (observable trait) and can be dominant or recessive, with dominant alleles masking the expression of recessive ones. For example, in humans, the gene for eye color has different alleles that produce different colors such as brown, blue, or green. The specific combination of alleles that an individual inherits determines their genotype, which in turn influences their phenotype. The study of alleles and their inheritance patterns is a fundamental concept in genetics and has important applications in fields such as medicine, agriculture, and evolutionary biology.
Here,
However, the specific alleles cannot be determined from this information alone. According to Mendel's laws of inheritance, each individual inherits two alleles for each trait, one from each parent. These alleles can be either the same (homozygous) or different (heterozygous). If the two alleles are different, one may be dominant and determine the organism's phenotype (observable trait), while the other may be recessive and not expressed in the phenotype. In the case of Mendel's purple-flowered pea plants, the specific alleles responsible for the purple flower color would have been determined through further experimentation and analysis.
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Which compound contains ionic bonds?
A. HBr B. CO₂ C .C6H12O6 D. NaBr
Answer:
D
Explanation:
Transfer of electrons from Na to Cl
Na has configuration of 2,8,1 it will lose one electron to Cl with configuration of 2,7 inorder for both to attain an octet configuration
Read "Sonnet VII" by Edna St. Vincent Millay. Then, answer the question that follows.
When I too long have looked upon your face,
Wherein for me a brightness unobscured
Save by the mists of brightness has its place,
And terrible beauty not to be endured,
I turn away reluctant from your light,
And stand irresolute, a mind undone,
A silly, dazzled thing deprived of sight
From having looked too long upon the sun.
Then is my daily life a narrow room
In which a little while, uncertainly,
Surrounded by impenetrable gloom,
Among familiar things grown strange to me
Making my way, I pause, and feel, and hark,
Till I become accustomed to the dark.
Which of the following is the best paraphrase of the bolded lines?
When I look at the sun, I am reminded of how bright and wonderful everything is in my life.
You remind me of the moon lighting up the darkness in a starless and cloudy night sky.
The sun is making me act so much like myself that I could stare at it for hours and not be affected.
You are so radiant that when I stare at you for too long, it feels as though I’m blinded and unsure of everything so I have to look away.
You are so radiant that when is tare at you for too long, it feels as though I'm blinded and unsure of everything so I have to look away- is the best paraphrase
What does the song by Edna St. Vincent Millay mean?
Renascence by Edna St. Vincent Millay is a powerful poetry. The poet ponders issues related to pain, aging, rebirth, and faith. The speaker is followed by the reader throughout "Renascence" as she lives, dies, and then is reborn in a fresh, faithful shape.
Like her colleague Robert Frost, Millay was one of the best sonnetists of the twentieth century. Like Frost, she was able to blend modernist viewpoints with established forms to create a distinctive brand of American poetry.
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a 4.60Lcontainer with a molecule piston has a pressure of 845 mmHg what is the pressure when the container is expanded to 10.6L
Therefore, the pressure when the container is expanded to 10.6 L is 367 mmHg.
What is molarity?Molarity, also known as molar concentration, is a unit of measurement used to express the concentration of a solution. It is defined as the number of moles of a solute dissolved in one liter of solution. The unit of molarity is moles per liter (mol/L), also written as M. For example, a solution with a molarity of 0.1 M contains 0.1 moles of solute per liter of solution. Molarity is commonly used in chemistry and biochemistry to describe the concentration of solutions in experiments and industrial processes.
Here,
We can use the combined gas law to solve for the new pressure:
P1V1/T1 = P2V2/T2
We are given:
P1 = 845 mmHg
V1 = 4.60 L
V2 = 10.6 L
Assuming that the temperature is constant, we can simplify the equation to:
P1V1 = P2V2
Solving for P2, we get:
P2 = P1V1/V2
Plugging in the values, we get:
P2 = 845 mmHg × 4.60 L / 10.6 L
P2 = 367 mmHg
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What is the net ionic equation of
2H+ + SO2 + Ca²+ + 2I → CaSO4 + 2H+ + 2I?
A. H₂SO4(aq) + Cal₂(aq) → CaSO4(s) + 2Hl(aq)
B. 2H+ + SO2 + Ca²+ → CaSO4 + 2H*
C. H+ + SO4²+ Ca²+ + 2I→CaSO4+H*+ I
D. SO4²+ Ca²+ → CaSO4
Answer:
The net ionic equation of 2H+ + SO2 + Ca²+ + 2I → CaSO4 + 2H+ + 2I is C. H+ + SO4²+ Ca²+ + 2I→CaSO4+H*+ I. This equation describes the process of a single replacement reaction, where the hydrogen ions and iodide ions react with the sulfate and calcium ions to form the insoluble compound of calcium sulfate and the remaining hydrogen and iodide ions
Explanation:
What characteristics do scientist use to classify stars? why is classifying stars important?
The classification of stars by astronomers helps them to better comprehend the various kinds of stars that exist in our galaxy and the cosmos as a whole.
Classification The temperature, mass, color, luminosity, and size of stars are among the many factors used to categorize them. Luminosity and brightness are frequently misunderstood terms. A star's brightness, which is a crucial indicator of how much energy it produces absolutely every second. In comparison to smaller, cooler stars, larger, hotter stars have higher luminosities. Astronomers classify stars according to their spectral class and luminosity class using the spectral lines of far-off stars.As opposed to that, the luminosity class provides usvisit with estimates of the star's size. Luminous supergiant stars have narrow spectral lines due to a phenomena called pressure broadening, but main sequence stars like the Sun will have wider spectral lines.For more information on star classification kindly visit to
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Other MC question needed to be answered. Please.
The initial concentration is 1.8 * 10^36 M.
The stoichiometry is 2A ⇒ B
The rate of disappearance of H2O2 is 4 mol/min
It decreases adhesion and increases cohesion
Not predictable since it can be at any level.
What is the order of a decomposition reaction?In a decomposition reaction, a single reactant breaks down into two or more products. The order of a decomposition reaction depends on the rate at which the reaction occurs with respect to the concentration of the reactant.
Given that;
ln[A] = ln[A]o - kt
ln(0.0015) = ln[A]o - (0.025 * 60 * 60)
-6.5 = ln[A]o - 90
-6.5 + 90 = ln[A]o
83.5 = ln[A]o
[A]o = e^83.5
[A]o = 1.8 * 10^36 M
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Three metal blocks of equal mass are placed in boiling water for several minutes. Each block is placed in a different insulated container with water in it. The equilibrium temperature for each sample is recorded. What is the best prediction for the missing value in the data table?
Question options:
26.1°C
27.9°C
29.3°C
36°C
The final temperature of the iron metal block is 27.9 ⁰C.
option B.
What is the final temperature of the iron mixture?The final temperature of the iron mixture is calculated by applying interpolation and extrapolation where necessary.
Since the mass of the metal blocks are equal, the final temperature of the iron metal block is calculated as follows;
0.39 ------------- 27 ⁰C
0.90 ------------- 35 ⁰C
0.45 -------------- ?
( 0.45 - 0.39 )/ ( 0.9 - 0.39 ) = ( ? - 27 ) / ( 35 - 27 )
0.1176 = ( ? - 27 ) / ( 8 )
? - 27 = 8 (0.1176)
? - 27 = 0.94
? = 27.94 ⁰C
? ≈ 27.9 ⁰C
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the freezing point of pure water is o.oC in the previous step you calculated that the freezing point changes by 1.09 C what is the new freezing point of the solution
The new freezing point of the solution if it is calculated that the freezing point changes by 1.09 C is -2.17° C.
How do you calculate the freezing point of the solution?Change in freezing point = x molality times Kf
Kf is the solvent's (water) freezing point constant, and molality is the solute's molal concentration in the solvent.
We can enter the following values into the algorithm to solve for molality because the freezing point reduction is specified as 1.09°C:
Kf x molality = 1.09
Water has a 1.86°C/m freezing point reduction constant. As a result, we have:
Molality equals 1.09 / 1.86 to 0.586 mol/kg.
We can use: to ascertain the solution's new freezing point:
Change in freezing point = m x I x Kf
As a result, we have:
[tex]T_{f}[/tex] = Kf x m x I = 1.86 °C per mete x 0.586 mol/kg x 2 = 2.17 °C
New freezing point is equal to 0 - 2.17 = -2.17 C.
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Relative formula mass- Calculate the relative formula mass of the foll
examples:
1) H₂O
Answer:
The relative formula mass of H₂O can be calculated by adding the atomic masses of two hydrogen atoms and one oxygen atom in the molecule. The atomic mass of hydrogen is 1 and the atomic mass of oxygen is 16. So, the relative formula mass of H₂O is:
(2 x 1) + 16 = 18
Explanation:
A 5.40 mol sample of solid A was placed in a sealed 1.00 L container and allowed to decompose into gaseous B and C.
The concentration of B steadily increased until it reached 1.40 M, where it remained constant.
A(s)↽−−⇀B(g)+C(g)
Then, the container volume was doubled and equilibrium was re‑established. How many moles of A remain?
The number of moles of A remaining at the new equilibrium is 1.93 mol.
What is the meaning of partial pressure?Partial pressure is the pressure exerted by a single gas component in a mixture of gases, assuming that the other gas components are absent or ideal. In other words, it is the pressure that the gas would exert if it were the only gas in the container at the same volume and temperature.
In a mixture of gases, each gas contributes to the total pressure of the system, which is the sum of the partial pressures of each gas. This is meant to refer to as Dalton's law of partial pressures. The partial pressure of a gas is proportional to its mole fraction in the mixture, which is the ratio of the number of moles of the gas to the total number of moles of all gases in the mixture.
The balanced equation for the reaction is:
A(s) ⇌ B(g) + C(g)
Let's denote the initial amount of A as nA. Since the molar mass of A is not given, we cannot determine its mass directly from the number of moles. However, we know that the initial amount of A is 5.40 moles, so we can write:
nA = 5.40 mol
At equilibrium, the concentration of B is given as 1.40 M. Using the ideal gas law, we can relate the concentration of B to its partial pressure:
PV = nRT
where P is the partial pressure of B, V is the volume of the container, n is the number of moles of B, R is the gas constant, and T is the temperature. Assuming that the volume of the container does not change during the reaction, we can write:
P = nBRT/V
where nB equals the number of moles of B. Since the concentration of B is given as 1.40 M, we have:
nB/V = [B] = 1.40 M
Substituting into the previous equation, we obtain:
P = nBRT/V = (1.40 M)(R)(T)
At equilibrium, the partial pressures of B and C must be equal, so we have:
P = PB = PC
Let's denote the number of moles of B and C as nB and nC, respectively. Since the total number of moles in the system is conserved, we have:
nA = nB + nC
At equilibrium, the number of moles of B is equal to the number of moles of C, so we have:
nB = nC = 0.5(nA)
Substituting into the ideal gas law expression for P, we obtain:
P = PB = PC = nBRT/V = (0.5nA)(R)(T)/V
We can use this equation to calculate the value of P at equilibrium. Then, when the volume of the container is doubled, the new pressure will be:
P' = P/2
At the new equilibrium, the partial pressures of B and C must be equal, so we have:
P' = PB' = PC'
We can use the same logic as before to write:
PB' = PC' = (0.5nA')(R)(T)/(2V)
where nA' is the number of moles of A remaining at the new equilibrium. Setting PB' equal to P' and solving for nA', we obtain:
nA' = nA(P')/(2P) = (5.40 mol)(1/2)/(P/P') = (5.40 mol)(1/2)/(1.40/2) = 1.93 mol
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how many moles of LiOH are required to produce 165 g of LiNO 3(the three is on the bottom right of the O)
2.39moles of LiOH are required to produce 165 g of LiNO[tex]_3[/tex]. The mole consists of precisely 6.022×10²³ elementary components.
What is mole?In the Worldwide System of Units, the mole (sign mol) is indeed the unit of material quantity (SI). The quantity of a substance is a measurement about how many elementary units of a certain substance are present in an object as well as sample.
The mole consists of precisely 6.022×10²³ elementary components.
Cr(NO[tex]_3[/tex])[tex]_3[/tex](aq) + LiOH(aq) → LiNO[tex]_3[/tex](aq) + Cr(OH)[tex]_3[/tex]
moles of LiNO[tex]_3[/tex] = 165/68.94=2.39moles
the mole ratio between LiOH and LiNO[tex]_3[/tex] is 1:1
moles of LiNO[tex]_3[/tex] = 2.39moles
Therefore, 2.39moles of LiOH are required to produce 165 g of LiNO[tex]_3[/tex].
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A mouthwash is 38.7 % ethanol by mass. If each bottle contains 0.280 pt of mouthwash with a density of 0.868 g/mL, how many kilograms of ethanol are in 159 bottles of the mouthwash? Please include the correct unit symbol with the answer. Note: 1 quart = 946 milliliters, 1.06 quarts = 1 liter, 1 pint = 473 milliliters, and 1 quart = 2 pints.
The mouthwash is included in 159 bottles, each of which contains about 7.05 kilos of ethanol.
What is the formula for mouthwash?Phenol, 5-methyl-2-(1-methylethyl)-, mixed with 1,3,3-trimethyl-2-oxabicyclo(2.2.2)octane and 5-methyl-2-(1-methylethyl)cyclohexanol. 460.7 molecular weight.
First, we must convert each bottle's mouthwash's pint-to-liter volume:
0.280 pt x 0.4732 L/pt = 0.1324 L
Using the density of the mouthwash in each bottle, we can determine its mass:
0.1324 L x 0.868 g/mL = 0.1149 kg
We can determine the mass of ethanol in each bottle because the mouthwash contains 38.7% ethanol by mass:
0.1149 kg x 0.387 = 0.0444 kg
the total mass of ethanol in 159 bottles of mouthwash:
0.0444 kg/bottle x 159 bottles
= 7.05 kg
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consider the first ionization energy of potassium and the third ionization energy of calcium. Which one would you expect to be higher, and why?
Answer:
Explanation: K+ has a higher ionisation energy than Ca+ , so K has a higher second ionisation energy than Ca .
HELP!!!! PLEASE! DUE TODAY! 40 PTS!
PROJECT: LAYERS OF THE ATMOSPHERE
The atmosphere is made of different layers. Each layer has distinguishing characteristics. For example, long flights in a plane usually remain in the stratosphere. When you see a falling star, it is a meteorite burning up in the mesosphere. This project will test your knowledge of each layer and its characteristics. You can review the layers of the atmosphere in Lesson 3 of this unit.
OBJECTIVES
Distinguish the layers of the atmosphere.
Create a model of the atmospheric layers.
Materials
Crayons, markers, or colored pencils
Posterboard
Instructions
Create a model of the atmosphere above the earth. Use a different color to indicate each layer of the atmosphere.
Provide a legend telling what each color represents.
Note a special feature of each layer. Some ideas of special features could be special functions or activities that occur in each layer, like weather or ionization. Or, you can include objects you might see in each layer, like planes, falling stars, northern lights, satellites, etc.
Note the average temperature or temperature range of each layer and how many miles from Earth each layer extends.
Answer: Your welcome!
Explanation:
Paragraph 1:
The atmosphere is composed of several layers, each with their own distinct characteristics. The closest layer to the earth is the troposphere which is about 10 miles above the surface of the earth. This layer is where we find most of our weather, temperature changes, and air pollution. The next layer is the stratosphere, which extends from 10 to 50 miles above the earth. This layer is known for its stable temperature and air pressure, as well as its concentration of ozone which absorbs much of the sun's ultraviolet radiation. At the top of the stratosphere is the mesosphere which extends to about 55 miles above the earth. This layer is known for its cold temperatures, making it the perfect place for meteoroids to burn up as they enter the atmosphere. Finally, the thermosphere extends from 55 to 400 miles above the earth, and is known for its extremely high temperatures, allowing for the aurora borealis to be visible here.
Paragraph 2:
To create a model of the atmosphere, one can use colored posterboard to represent the different layers. For example, the troposphere could be colored green to represent the air and clouds while the stratosphere could be colored blue to represent the ozone layer. The mesosphere could be colored orange to represent the burning of meteoroids, and the thermosphere could be colored purple to represent the aurora borealis. For each layer, one could provide a legend telling what each color represents, as well as a note about a special feature of each layer such as the activities that occur in each layer or the objects that can be seen in each layer. Additionally, one could provide the average temperature or temperature range of each layer, as well as how many miles from Earth each layer extends.
Paragraph 3:
Overall, creating a model of the atmosphere is an interesting and educational activity. By representing each layer in a different color, one can learn more about the different characteristics of each layer and how they relate to one another. Additionally, by providing a legend and notes about special features of each layer, one can gain a better understanding of the atmosphere and its components. Through this model, one can gain a better appreciation of the atmosphere and how it functions to protect our planet.
Can you help me with this please?
Precipitation reactions;
2KCl + Pb(NO3)2 ----> PbCl2 + 2KNO3
Ba(NO3)2 + K2SO4 -----> BaSO4 + 2KNO3
Hg2(C2H3O2)2 + 2NaCl -----> Hg2Cl2 + 2NaC2H3O2
Non precipitation reactions
C + O2 ---> CO2
HBr + KOH ----> KBr + H2O
HCl + KOH -----> KCl + H2O
H2O2 + NaOBr ----> NaBr + H2O + O2
What is a precipitation reaction?A precipitation reaction is a type of chemical reaction that occurs when two aqueous solutions (solutions dissolved in water) are mixed together and form an insoluble solid called a precipitate.
The reaction is characterized by the exchange of ions between the two aqueous solutions, which leads to the formation of the insoluble solid.
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2.72 Name the following ionic compounds: (a) KCN, (b) NaBrO2, (c) Sr(OH)2, (d) CoTe, (e) Fe2(CO3)3, (f) Cr(NO3)3, (g) (NH4)2SO3, (h) NaH2PO4, (i) KMnO4, (j) Ag2Cr2O7.
a) KCN = Potassium cyanide
b) NaBrO2 = Sodium bromite
c) Sr(OH)2 = Strontium hydroxide
d) CoTe = Cobalt telluride
e) Fe2(CO3)3 = Iron (III) Carbonate
f) Cr(NO3)3 = Chromium(III) nitrate
g) (NH4)2SO3 = Ammonium Sulfite
h) NaH2PO4 = Sodium dihydrogen phosphate
i) KMnO4 = Potassium permanganate
j) Ag2Cr2O7 = Silver dichromate
What is ionic compound class ?A chemical molecule known as an ionic compound in chemistry is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged atoms, or cations and anions, the compound is generally neutral.
These can be either polyatomic species, like the ammonium (NH+ 4) and carbonate (CO2 3) ions in ammonium carbonate, or straightforward ions, like the sodium (Na+) and chloride (Cl) in sodium chloride.
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Sodium (Na) + Chlorine (CI)=
Answer:
NaCl
Explanation:
Which of the following diatomic elements would have a mass of 19.08 grams stored in a container at and 100°C? (R= 0.0821 L atm/ mol K).
Fluorine is most likely the diatomic element with the mass of 19.08 grammes held in a container at 100°C (F2).
Is the element H2 diatomic?Diatomic molecules are those that contain two atoms. Iodine (I2), fluorine (F2), chlorine (Cl2), bromine (Br2), nitrogen (N2), oxygen (O2), and hydrogen (H2) are all diatomic elements. Diatomic molecules make up the bromine atom, Br2, in the periodic table.
Are all Group 7 atoms diatomic?The diatomic molecules of the group 7 elements are present. They have the chemical formulas F2, Cl2, Br2, and I2. Although the forces of attraction between molecules are minimal, the connection between the atoms in a molecule is quite strong. This explains why the boiling points of group 7 elements are low.
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Question:
Which of the following diatomic elements would have a mass of 19.08 grams stored in a container at and 100°C? (R= 0.0821 L atm/ mol K).
Thediatomic element with a mass of 19.08 grams stored in a container at 100°C is hydrogen (H2), which has a pressure of 27.2 atm.
What is Diatomic Elements?
Diatomic elements are chemical elements that exist as two atoms bound together in a molecule. Examples of diatomic elements include oxygen (O2), nitrogen (N2), hydrogen (H2), fluorine (F2), chlorine (Cl2), and iodine (I2).
To determine the diatomic element with a mass of 19.08 grams stored in a container at 100°C, we need to use the ideal gas law, which is given by:
PV = nRT
where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.
We can rearrange this equation to solve for the number of moles:
n = PV/RT
We are given the mass of the gas, which we can convert to moles using the molar mass of the element. The molar mass of a diatomic element is simply twice the atomic mass of the element. Using the periodic table, we find the following atomic masses:
H: 1.008
N: 14.007
O: 15.999
F: 18.998
We can calculate the molar mass of each diatomic element:
H2: 2 x 1.008 = 2.016 g/mol
N2: 2 x 14.007 = 28.014 g/mol
O2: 2 x 15.999 = 31.998 g/mol
F2: 2 x 18.998 = 37.996 g/mol
Now we can calculate the number of moles of the gas using the given mass and molar mass:
n = 19.08 g / molar mass
Using the molar masses above, we get:
For H2: n = 19.08 g / 2.016 g/mol = 9.47 mol
For N2: n = 19.08 g / 28.014 g/mol = 0.68 mol
For O2: n = 19.08 g / 31.998 g/mol = 0.60 mol
For F2: n = 19.08 g / 37.996 g/mol = 0.50 mol
Finally, we can use the ideal gas law to calculate the pressure of the gas, assuming a volume of 1 liter:
P = nRT/V = (number of moles) x R x (temperature in Kelvin) / V
Plugging in the values, we get:
For H2: P = 9.47 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 27.2 atm
For N2: P = 0.68 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.97 atm
For O2: P = 0.60 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.74 atm
For F2: P = 0.50 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.45 atm
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A liquid fuel mixture contains 28.30 % hexane (C6H14) , 15.75 % heptane (C7H16) , and the rest octane (C8H18) What maximum mass of carbon dioxide is produced by the complete combustion of 15.0 kg of this fuel mixture? .
Hexane, heptane, and octane have molar masses of Hexane (C6H14) has a molecular mass of 6 (12.01 g/mol) and 14 (1.00 g/mol) and heptane (C7H16) has a molecular mass of 7 (12.01 g/mol) and 16 (1.00 g/mol) and 100.21 g/mol.
Molar mass: What Is It?The mass in grammes of one mole of a chemical is its molar mass.The quantity of atoms, molecules, and ions contained in a substance is measured in terms of moles. A mole of any substance contains 6.022 x 1023 molecules.
Use 100 g of the fuel mixture as an example. Then:
Hexane weight is 28.30 grammes.
15.75 g is the heptane mass.
Octane mass is equal to 100 g, 28.30 g, 15.75 g, and 55.95 g.
The molar masses of hexane, heptane, and octane are:
Molar mass of hexane (C6H14) = 6(12.01 g/mol) + 14(1.01 g/mol) = 86.18 g/mol
Molar mass of heptane (C7H16) = 7(12.01 g/mol) + 16(1.01 g/mol) = 100.21 g/mol
Molar mass of octane (C8H18) = 8(12.01 g/mol) + 18(1.01 g/mol) = 114.23 g/mol
The number of moles of each component in 100 g of the fuel mixture is:
Moles of hexane = 28.30 g / 86.18 g/mol = 0.3282 mol
Moles of heptane = 15.75 g / 100.21 g/mol = 0.1573 mol
Moles of octane = 55.95 g / 114.23 g/mol = 0.4899 mol
Therefore, the mole fractions of each component are:
Mole fraction of hexane = 0.3282 / (0.3282 + 0.1573 + 0.4899) = 0.3841
Mole fraction of heptane = 0.1573 / (0.3282 + 0.1573 + 0.4899) = 0.1838
Mole fraction of octane = 0.4899 / (0.3282 + 0.1573 + 0.4899) = 0.4321
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Which molecule has a double bond
And explain how you know
Answer:
The ans is simple: O2
Explanation:
Oxygen has 6 electrons on its outer shell and to be in stable form it shares 2 electrons with the other one and forms double bond.
CAN SOMEONE HELP WITH THIS QUESTION?✨
In the Preparation of Copper (l) Chloride experiment, Could we use HCl to dissolve the copper metal instead of nitric acid in the first reaction?
No, using hydrochloric acid (HCl) to dissolve copper metal in the Preparation of Copper (I) Chloride experiment is not recommended because it would result in the formation of copper (II) chloride rather than copper (I) chloride.
How to prepare Copper (l) Chloride?
Copper metal reacts with hydrochloric acid to form copper (II) chloride and hydrogen gas:
Cu (s) + 2HCl (aq)
→ CuCl2 (aq) + H2 (g)
In contrast, when copper metal reacts with nitric acid, it is oxidized to copper (II) ions by the nitric acid. These copper (II) ions then react with copper metal to form copper (I) ions, which react with chloride ions to form copper (I) chloride:
Cu (s) + 4HNO3 (aq) → Cu(NO3)2 (aq) + 2NO2 (g) + 2H2O (l)
Cu(NO3)2 (aq) + 2Cu (s) → 3Cu2+ (aq) + 2NO3- (aq)
3Cu2+ (aq) + 2Cl- (aq) → Cu3Cl2 (s)
Therefore, to obtain copper (I) chloride, it is necessary to use nitric acid in the first reaction.
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Answer the following:
The balanced equation for the following chemical reactions are:
a. 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g)
b. Ca₃(PO₄)₂(aq) + 2H₃PO₄(aq) → 3Ca(H₂PO₄)₂(aq)
c. 3NaOH(aq) + FeCl₃(aq) → Fe(OH)₃(s) + 3NaCl(aq)
What makes a reaction balanced?A chemical reaction is balanced when the number of atoms of each element in the reactants equals the number of atoms of that element in the products. In other words, the law of conservation of mass is satisfied.
This means that no atoms are created or destroyed during a chemical reaction, they are only rearranged to form different molecules. To balance a chemical equation, coefficients are added in front of the chemical formulas to adjust the number of atoms of each element.
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Calculate the number of Li
atoms ( NLi
) in 8.1 mol
of Li
The number of atoms of lithium, Li in 8.1 moles of lithium, Li is 4.88×10²⁴ atoms
How do i determine the number of atoms?From Avogadro's hypothesis, we understood that 1 mole of a substance contains 6.02×10²³ atoms. Thus, we can say that:
1 mole of Li = 6.02×10²³ atoms
With the above information, we can determine the number of atoms in 8.1 moles of lithium, Li. Details below:
Number of mole of Li = 8.1 molesNumber of atoms =?1 mole of Li = 6.02×10²³ atoms
Therefore,
8.1 moles of Li = (8.1 mole × 6.02×10²³ atoms) / 1 mole
8.1 moles of Li = 4.88×10²⁴ atoms
Thus, from the above calculation, it is evident that the number of atoms is 4.88×10²⁴ atoms
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Calculate the mass in grams of 2.5 moles of c
a ballon contains 7.36 g of oxygen gas, how many oxygen molecules are in the balloon
There are approximately 1.39 × 10²³ oxygen molecules in the balloon.
What is the characteristics of oxygen gas?Oxygen is colorless, odorless and tasteless gas and it supports life. It is noncombustible but actively supports the burning of combustible materials.
To calculate number of oxygen molecules in the balloon, we use the Avogadro's number, which is equal to 6.022 × 10²³ molecules per mole of substance.
As moles of oxygen gas = mass of oxygen gas / molar mass of oxygen gas
moles of oxygen gas = 7.36 g / 32 g/mol
So, moles of oxygen gas = 0.23 mol
Now we use the Avogadro's number to calculate number of oxygen molecules in the balloon:
As number of oxygen molecules = moles of oxygen gas × Avogadro's number
number of oxygen molecules = 0.23 mol × 6.022 × 10²³ molecules/mol
number of oxygen molecules = 1.39 × 10²³ molecules
Therefore, there are approximately 1.39 × 10²³ oxygen molecules in the balloon.
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Question 9
What mass of sodium bromide is needed to prepare 2.50 liters of a 0.750 M NaBr solution?
O 30.9 g
O 54.9 g
O 193 g
O 343 g
O 77.2 g
C
.
It takes approximately 193 g of sodium bromide to make 2.50 litres of 0.750 M NaBr solution.
What exactly is molar mass?A substance's molar mass is the mass of one mole. It's measured in grammes per mole (g/mol). The molar mass of an element is equal to its atomic weight in atomic mass units (amu), but the molar mass of a compound is the sum of all the atomic weights in the compound represented in grammes. The idea of molar mass is significant in chemistry because it allows us to convert between mass, moles, and the number of particles in a substance.
We can use the following formula to calculate the mass of sodium bromide required to make the given solution:
mass = moles x molar mass
First, we need to calculate the number of moles of sodium bromide needed:
moles = Molarity x volume
moles = 0.750 mol/L x 2.50 L
moles = 1.875 mol
Next, we need to determine the molar mass of NaBr:
NaBr = 22.99 g/mol + 79.90 g/mol
NaBr = 102.89 g/mol
Finally, we can calculate the mass of NaBr needed:
mass = moles x molar mass
mass = 1.875 mol x 102.89 g/mol
mass = 192.92 g
Therefore, the mass of sodium bromide needed to prepare 2.50 liters of a 0.750 M NaBr solution is approximately 193 g (option C).
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when the maximum amount of solid is dissolved in a solute what kind of solution is it?
The 12g is the maximum amount of solid is dissolved in a solute, ionic solution.
What is solution ?
A steady change in the relative ratios of two or more substances up to the point at which they become homogenous when combined; this point is known as the limit of solubility.
What is solute ?
Solute refers to an object that dissolves in a solution. In fluid solutions, there is a larger concentration of solvent than solute. Salt and water are two excellent examples of substances that we use on a daily basis. Since salt dissolves in water, it serves as the solute.
Therefore, The 12g is the maximum amount of solid is dissolved in a solute, ionic solution.
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Washing soda crystals react with acid to give off carbon dioxide. If you added some washing soda crystals to vinegar, what would you see happening
A reaction produces 0.829 moles of H20. How many molecules of H2O are produced?
The molecules of H2O that are produced are: 4.98 × 10²³ molecules of H2O
What is meant by a reaction?Process in which one or more substances are converted to one or more different products is called a chemical reaction.
To calculate the number of molecules of H2O produced, we can use the Avogadro's number, which is equal to 6.022 × 10²³ molecules per mole of substance.
number of molecules = moles of substance × Avogadro's number
number of molecules = 0.829 moles × 6.022 × 10²³molecules/mol
number of molecules = 4.98 × 10²³molecules
Therefore, approximately 4.98 × 10²³ molecules of H2O are produced.
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