Answer:
3,272,000
Explanation:
Find the number of molecules in 3.72 mol of sulfur dioxide: There are 78.54 g of nitrogen dioxide in 3.72 mol of sulfur dioxide, so there are 3,272,000 molecules in 3.72 mol of sulfur dioxide.
A piece of metal with a mass of 14.9 g is heated from 72.35°C. When the metal is placed in 75.0 g of water at 20.0°C, the temperature of the water rises by 2.85°C. What is the specific heat capacity of the metal? Assume all heat released by metal is absorbed by the water.
A piece of metal with a mass of 14.9 g is heated from 72.35°C. When the metal is placed in 75.0 g of water at 20.0°C, the temperature of the water rises by 2.85°C. 66.35 joule/Kg °C is the specific heat capacity of the metal.
What is specific heat capacity?In thermodynamics, the specific heat capacity (symbol c) of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capacity.
Informally, it is the amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in temperature.
Cp of metal× Mass of metal*(initial temperature-final temperature)=Cp of water× Mass of water×(final temperature - initial temperature)
Cp of metal×14.9×(98–28.5)=Cp of water×75×(28.5–20)
Cp of metal×14.9×(98–28.5)=Cp of water×75×(28.5–20)
Cp of metal =66.35 joule/Kg °C.
Therefore, 66.35 joule/Kg °C is the specific heat capacity of the metal.
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First get correct I’ll mark you as brainlist!!!!!⚠️⚠️⚠️⚠️
Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.
What is the mass of 2.20 x 1022 formula units of NaOH (Molar mass = 40.0 g/mol)?
Express the mass in grams to three significant figures.
To calculate the mass of 2.20 x 10^22 formula units of NaOH, we first need to find the number of moles of NaOH using Avogadro's number (6.02 x 10^23):
Number of moles of NaOH = (2.20 x 10^22 formula units) / (6.02 x 10^23 formula units/mol)
Number of moles of NaOH = 0.0365 mol
Next, we can use the molar mass of NaOH (40.0 g/mol) to convert the number of moles to mass:
Mass of NaOH = (0.0365 mol) x (40.0 g/mol)
Mass of NaOH = 1.46 g
Therefore, the mass of 2.20 x 10^22 formula units of NaOH is 1.46 grams (rounded to three significant figures).
Fill in the missing parts of the two tables (Structural Formula Lines)
In a structural formula all types of bonds can be represented. A single bond is indicated by a dash, double dash for double bonds and triple dash for triple bonds.
What is a structural formula?A structural formula consists of symbols for the atoms which are connected by the short lines called chemical bonds. It represents how the atoms are arranged in a molecular formula of the chemical compound.
The structural formula of the compounds are:
1. HCl - H - Cl
2. SeI₂ - I - Se - I
3. CO₂ - O = C = O
The structural formula of NH₃ and CCl₄ is given below.
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Answer and solve the following:
IV. Acetylene is a hydrocarbon molecule composed of two carbon atoms and two hydrogen atoms. It is a flammable gas, and when ignited with a spark, it produces an extremely hot flame.
What is molecule ?Molecule is a unit of matter composed of two or more atoms bonded together. Atoms are the basic building blocks of all matter, and molecules are collections of atoms. Molecules can range in size from diatomic molecules composed of two atoms, to large macromolecules made up of hundreds of atoms. Molecules can vary in shape and complexity, and can consist of a variety of different elements. Molecules can be found in all physical states, including solids, liquids, and gases.
Ethylene is a hydrocarbon molecule composed of two carbon atoms and four hydrogen atoms. It is a gas with a sweet odor and is found naturally in plants, fruits, and vegetables.
I.
a. Cr2O3 (Chromium (III) oxide);
b. NH4H2PO4 (Ammonium dihydrogen phosphate);
c. CaSO4 (Calcium sulfate).
II.
a. Iron(II) Chloride
b. Barium Hydroxide
c. Lithium Cyanide
d. Lead(II) Chloride
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CAN SOMEONE HELP WITH THESE QUESTIONS BASED ON THE TYPES OF CHEMICAL REACTIONS EXPERIMENT?✨
1- What type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate?
2- Which of the compounds or ions used in this lab is toxic?
3- What is a catalyst?
4- Why is universal indicator in this lab?
The type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate is displacement reaction.
Magnesium sulfate in large doses may be toxic.
A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values
What is Displacement reaction?A displacement reaction is a type of reaction in which part of one reactant is replaced by another reactant. A displacement reaction is also known as a replacement reaction or a metathesis reaction.
Single displacement reactions are reactions where one reactant replaces part of the other:
AB + C → AC + B
An example is the reaction between iron and magnesium sulfate to produce iron sulfate and copper:
Fe + MgSO₄ → FeSO₄ + Mg
Therefore,
The type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate is displacement reaction.
Magnesium sulfate in large doses may be toxic.
A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values
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(b) If a water sample considered to be hard water contains 64 mg of CaCO3 per 300 ml of water. Calculate the hardness in terms of MgSO4 equivalent in mg/litre of MgS 04-
Answer:
Moderately hard water – 61 to 120 mg/L (PPM) or 3.56 to 7 GPG. Hard water – 121 to 180 mg/L (PPM) or 7.06
Explanation:
Create a visual guide explaining fireworks and their colors. Explain energy levels in atoms and how it relates to colors.
Determine the grams of H₂O produced when 0.485 grams of O₂ reacts with H₂
according to the following reaction:
-)
2 H₂(g) + O₂(g) →
2 H₂O(1)
Taking into account the reaction stoichiometry, 0.546 grams of H₂O are produced when 0.485 grams of O₂ reacts with H₂.
Reaction stoichiometryIn first place, the balanced reaction is:
2 H₂ + O₂ → 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂: 2 molesO₂: 1 moleH₂O: 2 molesThe molar mass of the compounds is:
H₂: 2 g/moleO₂: 32 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂: 2 moles ×2 g/mole= 4 gramsO₂: 1 mole ×32 g/moles= 32 gramsH₂O: 2 moles× 18 g/mole= 36 gramsMass of H₂O formedThe following rule of three can be applied: if by reaction stoichiometry 32 grams of O₂ form 36 grams of H₂O, 0.485 grams of O₂ form how much mass of H₂O?
mass of H₂O= (0.485 grams of O₂× 36 grams of H₂O) ÷32 grams of O₂
mass of H₂O= 0.546 grams
Finally, 0.546 grams of H₂O are formed.
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What is the mass of 0.25 moles of calcium sulfate
[CaSO4]?
Answer:
The mass of 0.25 moles of calcium sulfate is 34.035 grams
Explanation:
mass=number of moles × molar mass
= 0.25 × 134.14 g/ml
= 34.035g
During the decomposition of KClO3, 2.94 grams of oxygen gas are created. How many moles of KClO3 reacted? Report your answer with 3 significant figures.
The balanced chemical equation for KClO3 decomposition is: 2KClO3(s) → 2KCl(s) + 3O2(g). 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.
How many moles of KClO3 reacted?
The balanced chemical equation for KClO3 decomposition is:
2KClO3(s) → 2KCl(s) + 3O2(g)
According to the equation, for every 3 moles of O2 produced, 2 moles of KClO3 react. Therefore, the number of moles of KClO3 can be calculated as:
moles of KClO3 = (2/3) × moles of O2
To find the moles of O2 produced, we need to use the molar mass of O2, which is 32 g/mol. As a result, the number of moles of O2 is:
moles of O2 = mass of(O2) / molar mass(O2)
moles of O2 = 2.94 g / 32 g/mol
moles of O2 = 0.092 mol
Now we can calculate the moles of KClO3:
moles of KClO3 = (2/3) × moles of O2
moles of KClO3 = (2/3) × 0.092 mol
moles of KClO3 = 0.061 mol
Therefore, 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.
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what features is used to compare the different groups of people in the world?
There are various parameters used to group people around the world. We can use the cost of living, place of residence, life style, culture etc. to compare different groups of people in the world.
What are features for social comparison?According to the social comparison hypothesis, people evaluate their own social and personal worth by evaluating how they stack up against others. The comparison strategies people use to assess their actions, successes, and ideas in relation to those of other people are described by Leon Festinger's comparison theory, which was first presented in 1954.
In addition to influencing how people perceive themselves, social comparison also affects how they act. Think about how social comparisons, both positive and negative, can affect how you feel about yourself. belief, certainty, drive, and attitude.
Comparing the life styles, culture, socio-economic status, language etc. are general features used to compare different group of people around the world.
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Both conclusions are based on valid data and scientific reasoning. How can both conclusions be valid
Both conclusions can be valid as they are based on valid data and scientific reasoning. This is due to the fact that different data sets and scientific arguments can lead to different conclusions.
What is conclusions?A conclusion is a summary of the main points discussed in an essay, report, presentation, or other document. It should be concise and well-written, and should not include any new information or arguments. A conclusion typically reviews the main points and ties them together, offering a final perspective on the topic. It is important to write a clear and effective conclusion, as it is the last thing the reader will read and will leave them with a lasting impression. A good conclusion can solidify the main idea of the document and leave the reader with a sense of closure.
For example, one data set may show that a particular drug is effective in treating a certain condition, while another data set may show that the same drug is not as effective. Therefore, both conclusions can be valid as long as the data and scientific reasoning used to draw them are valid.
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What is the spring constant if 125J of energy is stored when a spring is compressed 0.300m?
2780N/m
833N/m
417N/m
1390N/m
The spring constant if 125J of energy is stored when a spring is compressed 0.300m is option A which is 2780N/m
Spring constant calculation.The potential energy stored in a spring is given by the formula:
PE = (1/2) k x^2
where PE is the potential energy, k is the spring constant, and x is the displacement of the spring from its equilibrium position.
We can use this formula to find the spring constant if we know the potential energy stored and the displacement of the spring:
PE = (1/2) k x^2
Rearranging the formula gives:
k = 2PE / x^2
Substituting the given values into the formula gives:
k = 2(125 J) / (0.300 m)^2
k = 2780 N/m
Therefore, the spring constant is 2780 N/m.
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2.74 Give the chemical formula for each of the following ionic com- pounds: (a) sodium phosphate, (b) zinc nitrate, (c) barium bromate, (d) iron(II) perchlorate, (e) cobalt(II) hydrogen car- bonate, (f) chromium(III) acetate, (g) potassium dichromate.
Phosphate of sodium: Nitrate of zinc, Na3PO4, Zn(No3)2, bromate of barium: Perchlorate of iron (II) and ba(BrO3)2: Cobalt (II) hydrogen carbonate, Fe(ClO4)2: Co(HCO3)2 as cobalt bicarbonate.
Is acetic acid C2H3O2?Acetic acid, also known as ethanoic acid, is an organic compound with the chemical formula CH3COOH (also written as C2H4O2, HC2H3O2) that is an acidic, colorless liquid.
How does K2Cr2O7 function as an oxidizer?As the oxidation state of their atoms increases during a chemical reaction with potassium dichromate, elements become more electronegative. Potassium dichromate is a potent oxidizer in an acidic environment. K2Cr2O7 is present as Cr2O7 - (orange) in acidic medium, but it is transformed into CrO4 - (yellow) in basic medium.
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HELP ILL MARK YOU AS BRAINLIST.!
Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 4.20 molesmoles of magnesium perchlorate, Mg(CIO4)2Mg. Express the number of moles of MgMg, CICI, and OO atoms numerically, separated by commas.
The chemical formula for magnesium perchlorate is Mg(ClO4)2, which contains 1 magnesium atom (Mg), 2 chlorine atoms (Cl), and 8 oxygen atoms (O).
To calculate the number of moles of each element in 4.20 moles of Mg(ClO4)2, we need to use the mole ratios from the chemical formula.
Moles of Mg:
In one mole of Mg(ClO4)2, there is one mole of Mg atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 4.20 moles of Mg atoms.
Moles of Cl:
In one mole of Mg(ClO4)2, there are 2 moles of Cl atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 2 x 4.20 = 8.40 moles of Cl atoms.
Moles of O:
In one mole of Mg(ClO4)2, there are 8 moles of O atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 8 x 4.20 = 33.6 moles of O atoms.
So the number of moles of Mg, Cl, and O atoms in 4.20 moles of Mg(ClO4)2 are: 4.20, 8.40, and 33.6, respectively.
Answer:
Explanation:
7.50 mol Mg
(ClO4)2
contains:
7.50 mol Mg atoms
15.0 mol Cl atoms
60.0 mol O atoms
1 mol Mg(ClO4)2
contains
1 mol Mg atoms, 2 mol Cl atoms, and 8 mol O atoms.
What volume of a 0.88 M solution can be made using 130g of FeCl2
the answer is
volume = 1.16L
What is the order of reaction?
Answer:
The Order of reaction refers to the relationship between the rate of a chemical reaction and the concentration of the species taking part in it.
What is the hydroxide ion concentration of a solution with a pOH of 5.0?
Answer:
0.00001 M
Explanation:
The pOH of a solution is defined as the negative logarithm of the hydroxide ion concentration:
pOH = -log[OH-]
Therefore, we can rearrange this equation to solve for [OH-]:
[OH-] = 10^(-pOH)
If the pOH of a solution is 5.0, then:
[OH-] = 10^(-5.0)
[OH-] = 1.0 x 10^(-5.0)
[OH-] = 0.00001
Therefore, the hydroxide ion concentration of the solution is 0.00001 M.
c) Where would you expect to observe a peak due to the carbonyl stretching vibration in the vibrational-Raman spectrum of guanine, if the 514.5 nm line of an argon ion laser was used as the incident light source? Express your answer in both relative reciprocal centimetres (relative cm–1) and in nanometers (nm). (3 marks) d) i) What would the peak position be if the 488 nm line from the argon-ion laser was used instead of the 514.5 nm line? Give you answer in both nm and in relative cm–1. ii) What would the relative intensity of the peak be if the 488 nm line from the argon-ion laser was used instead of the 514.5 nm line? (Assume that the power output of the laser was the same at both wavelengths.)
The carbonyl stretching vibration of guanine is expected to give rise to a peak in the vibrational-Raman spectrum at a wavenumber of around 1660-1700 cm^-1.
How to explain the information
The specific location of the peak can be affected by a variety of factors, including the excitation wavelength, the sample preparation method, and the environment in which the sample is analyzed.
If the 514.5 nm line of an argon ion laser is used as the incident light source, the Raman shift associated with the carbonyl stretching vibration of guanine would be expected to be in the range of 620-670 cm^-1. However, it's important to note that the exact position of the peak may vary depending on the specific experimental conditions.
An overview was given as the information is incomplete.
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A solution is formed by mixing 400. mL of 1.0 M NH3 and 100. mL of 0.75 M AgNO3. The reaction
Ag+ + 2NH3 Ag(NH3)2+, Kf = 1.6 x 107, goes essentially to completion.
(a) What are the final concentrations of the principal species?
the major species ultimate concentrations of AgCl+2NH 3[Ag(NH 3) 2] + +Cl − K=K 1 K two =1.7×10 7 ×1.85×10 −10 =0.31×10 −2.
AgCl is water soluble, right?Na+, Ag+, Cl-, & NO3- are present in the solution as a result, however AgCl is not water soluble. Cl- and Ag+ are currently dissolved together, and as a result, AgCl will precipitate out of solution after the two have combined to create AgCl.
Why would someone use silver chloride?In order to help with mercury elimination, silver chloride has indeed been employed as an antidote to mercury poisoning. a component of several personal deodorant products that acts as an antibacterial agent. to keep drinking water in tanks clean and safe for a long time.
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A 50.0 ml solution of NH3 was titrated with 0.10 M. the volume of titrationrequired to reach the equivalnece point wasdetremined to equal38.25 ml(kb= 1.8x10^-5. What is concentration of NH3in the original 50.0 ml solution?
The initial 50.0 ml solution had a 0.0765 M [tex]NH_{3}[/tex] concentration.
What does chemistry mean by concentration?The amount of solute contained in a specific amount of solution is the substance's concentration. The quantity of moles per solution in 1 L of solution, or molarity, is used to represent concentrations.
The balanced chemical equation is :
[tex]NH_{3} +HCl[/tex] → [tex]NH_{4} Cl[/tex]
moles of [tex]NH_{3}[/tex] = moles of HCl
To fond moles of HCl :
moles of HCl = concentration of HCl * volume of HCl used
moles of HCl = 0.10 M * 0.003825
To find the concentration of [tex]NH_{3}[/tex] in the original solution is :
concentration of [tex]NH_{3}[/tex] = moles of [tex]NH_{3}[/tex] / volume of solution
concentration of [tex]NH_{3}[/tex] = 0.003825 mol / 0.050 L
concentration of [tex]NH_{3}[/tex] = 0.0765 M
Therefore, the concentration of [tex]NH_{3}[/tex] in the original 50.0 ml solution is 0.0765 M.
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Which of the following is NOT an accurate way to measure wavelength?
A. crest to trough
B. trough to trough
C. half crest to half crest
D. crest to crest
Answer:
B. trough to trough is NOT an accurate way to measure wavelength.
Explanation:
The correct way to measure wavelength is from crest to crest or from trough to trough, as these are the points of maximum displacement in the wave. Alternatively, one could measure from a point halfway between two crests (or two troughs) to another point halfway between the next two crests (or troughs), which is known as half crest to half crest measurement.
The accurate ways to measure the wavelength of a wave are between two crests (crest to crest), two troughs (trough to trough), or half crest to another half crest. Measuring from a crest to a trough gives half the wavelength. Therefore, option A (crest to trough) is not an accurate way to measure wavelength.
Explanation:In the context of wave physics, the accurate ways to measure the wavelength of a wave are between two successive crests (crest to crest), or two troughs (trough to trough). The measurement from a half crest to another half crest is also valid, as it essentially represents the same distance as from crest to crest or trough to trough. However, measuring from a crest to a trough does NOT give you the wavelength, but instead it gives you half the wavelength because a complete wave cycle is from crest to crest or trough to trough. Therefore, option A (crest to trough) is NOT an accurate way to measure wavelength.
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What is the atomic mass of an oxygen isotope that has 8 protons and 10 neutrons in its nucleus?
Responses
8 amu
10 amu
18 amu
not enough information to calculate
Answer:
C. 18 amu
Explanation:
The atomic mass can be defined as the mass of neutrons and protons in the atom.
Atomic mass of oxygen = 10 + 8 = 18 amu
how many moles of OH are in 1.20 moles of Mg(OH)2
In one mole of Mg(OH)2, there are 2 moles of OH. Therefore, in 1.20 moles of Mg(OH)2, there are: 2 moles of OH/mol of Mg(OH)2 x 1.20 mol of Mg(OH)2 = 2.4 moles of OH.
What distinguishes a mole from a molarity?Mole measures the quantity of chemicals, whereas molarity measures the concentration of those substances. The amount of chemicals in a combination can be estimated by looking at its molarity. One volume of a solvent is equal to the number of moles of a material. Molarity is not a unit, although a mole is.
Are moles and molarity the same?Molarity (M) is calculated by dividing the volume of the solution (V) in litres by the number of moles of solute (n). Not moles of solute per litre of solvent, but rather moles of solute per litre of solution, is a crucial distinction to make when defining molarity.
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What is the mass of 2.25 moles of sulfuric acid (H2 SO4)?
Answer:
The molar mass of sulfuric acid (H2SO4) can be calculated by adding the atomic masses of its constituent atoms:
Molar mass of H2SO4 = 2(1.008 g/mol) + 1(32.06 g/mol) + 4(15.99 g/mol) = 98.08 g/mol
Therefore, the mass of 2.25 moles of H2SO4 is:
mass = number of moles x molar mass
mass = 2.25 moles x 98.08 g/mol = 220.68 g
So, the mass of 2.25 moles of sulfuric acid is 220.68 grams.
Explain the process of electroplating a metal spoon with zinc, state the anode cathode and electrolytes to be used. Balance the anodic and cathodic equations at the end of the electroplating.
The metal would be the cathode and Zinc would be the anode. There must be an anode and a cathode in an electrochemical cell.
How do you electroplate a metal with zinc?Steps to electroplate a metal with zinc:
Prepare the electrolyte solution: Dissolve zinc sulfate in water to make a solution. This will serve as the electrolyte solution.
Prepare the metal to be plated (cathode): Clean the metal to be plated thoroughly to remove any dirt, grease, or other contaminants. This is important to ensure good adhesion of the zinc plating.
Prepare the zinc anode: Clean the zinc anode thoroughly and suspend it in the electrolyte solution.
Set up the electroplating apparatus: Connect the positive terminal of the power supply to the zinc anode and the negative terminal to the metal to be plated (cathode). Place the metal to be plated (cathode) in the electrolyte solution.
Start the electroplating process: Apply a direct current (DC) voltage to the electrodes. This will cause the zinc ions in the electrolyte solution to be attracted to the metal to be plated (cathode) and deposit on its surface.
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Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen, whereas a balloon filled with He does not
Answer:
The balloon filled with 02 collapses because the gas molecules are attracted to each other and condense into a liquid when cooled. Helium, on the other hand, is a noble gas that does not form compounds with other elements and therefore does not condense into a liquid at low temperatures.
Molecules are larger compounds consisting of repeating elemental or molecular units
all covalently bonded together, such as a diamond.
A. True
B. False
An 80.0 g sample of a gas was heated from 25 ∘C to 225 ∘C. During this process, 346 J of work was done by the system and its internal energy increased by 9135 J. What is the specific heat of the gas?
C=J/(g⋅ ∘C)
Explanation:
The first law of thermodynamics can be written as:
ΔU = Q - W
where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.
We know that ΔU = 9135 J and W = 346 J. We also know that the gas was heated from 25 ∘C to 225 ∘C. Therefore, the change in temperature is:
ΔT = 225 ∘C - 25 ∘C = 200 ∘C
We can use the specific heat formula to solve for the specific heat of the gas:
Q = mcΔT
where m is the mass of the gas and c is the specific heat of the gas.
Solving for c, we get:
c = Q / (mΔT)
Substituting the given values, we get:
c = 346 J / (80.0 g × 200 ∘C) = 0.0216 J/(g⋅ ∘C)
Therefore, the specific heat of the gas is 0.0216 J/(g⋅ ∘C).
According to the solubility curve below, which of the following statements is true about potassium nitrate (KNO3) at 60°C?
That is equivalent to 1.1 grams of ammonium hydroxide per gram of water if the solubility at 60 ° C is 110 grams of potassium chloride for every 100 gram of water.
How do nitrates affect the body?The physiological actions of nitrate, which are comparable to those of NO, include lowering blood pressure, preventing platelet aggregation, and providing a protective impact on blood vessels.
For what is nitrate renowned?Its monikers include nitrate of potash, nitre, and saltpeter (saltpetre). In addition to various different forms of pyrotechnics, it is used to make nitric acid and fuel for model rockets. It serves as both a fertilizer and a food preservative.
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Answer:
The solubility of KNO3 is approximately 110 g/100 mL
Explanation:
here is a proper explanation