Answer:
C
Explanation:
this is because the rest talk about the findings of protons,neutrons and electrons.
what is the concentration of hydroxide ion in an aqueous solution with an h concentration of 2 x 10-5 m?
The concentration of hydroxide ions is
4.89 x 10^-10
Given:
[H3O+] = 2 x 10^-5 m
To Find:
pOH of solution
Solution:
pH = -log[H3O+]
pH = -log[2 x 10^-5]
pH = 4.69
pH + pOH = 14
pOH = 14 - 4.69 = 9.31
Now , we can calculate the concentration of hydroxide ions of the solution very easily as shown below :
[OH-] = 10^-pOH
[OH-] = 10^-9.31
[OH-] = 4.89 x 10^-10
Thus , the concentration of hydroxide ions is
Thus , the concentration of hydroxide ions is 4.89 x 10^-10
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determine whether each description describes fat-soluble or water-soluble vitamins. not all descriptors will be used.
Vitamins are one of the six classes of food.
What are vitamins?Vitamins are one of the six classes of food. Some of the vitamins could be dissolved in water while some can not be dissolved in water. The vitamins that could dissolve in water are called water soluble vitamins while the vitamins that could only dissolve in fat are called fat soluble vitamins.
Now let us classify the vitamins based on description;
Fat soluble vitamins;
Vitamins that travel with dietary fats through the bloodstream Vitamin that provide 2 kcals per gram Vitamins A, D, E.&KVitamins that are converted to fat in the liverVitamins that are mostly stored in the liver and fatty tissuesWater soluble vitamins;
Vitamins that could be easily lost during food preparationVitamins that include B and CVitamins that are easily excreted form the bodyLearn more about vitamins:https://brainly.com/question/1165711
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Why does an object such as a cannonball appear to fall toward Earth, rather
than Earth falling toward the cannonball?
A. The force of gravity acting on the cannonball is greater than the
force of gravity acting on Earth.
OB. Earth has a large radius, so the distance from the center of the
Earth to the cannonball is greater than the distance from the
cannonball to Earth.
C. The force of gravity acting on Earth is greater than the force of
gravity acting on the cannonball.
OD. Earth has a much greater mass than the cannonball, so the same
amount of force acting on Earth results in much less acceleration.
The force of gravity acting on Earth is greater than the force of gravity acting on the cannonball. Option C is correct.
This is because according to Newton's third law of motion, for every action there is an equal and opposite reaction. When the cannonball is released or fired, it experiences a force of gravity pulling it towards Earth. However, Earth also experiences an equal and opposite force of gravity pulling it towards the cannonball.
Since Earth has a much greater mass than the cannonball, the force of gravity acting on it is much stronger than the force acting on the cannonball. Therefore, the cannonball appears to fall towards Earth, while Earth remains relatively stationary. Option C is correct.
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Describe the
process of
sublimation
Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.
Sublimation is that the method by that a substance changes from its solid to vaporous state while not transitioning to its liquid state. At a temperature and pressure below the substance's triple purpose, this method, Associate in Nursing heat-absorbing natural process, takes place.
Solids will directly elegant into the air if they need enough pressure level at a given temperature. Sublimation happens once a solid reaches its triple point below extreme pressure. The triple point is that the temperature and pressure at that a substance will at the same time exist all told 3 of its famed states of matter. A substance's triple point is one in every of its distinctive points.
The opposite of this method, during which a gas is remodeled straight into a solid state, is Desublimation or deposition.
The best illustration of sublimation is solid, that is Carbon dioxide that has been frozen. solid directly transforms from its solid state to a vaporous state, that is visible as fog, once it's exposed to air. The vaporous state of frozen dioxide is additional stable than the solid state.
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to show the electron configuration for an atom, when would it be better to use an orbital notation than to use a written configuration with numbers, letters, and superscripts? when the aim is to use less space
The aim is to use less space while demonstrating the distribution of electrons in shells
If you want to depict how an atom's electrons are scattered across its subshells, an orbital notation is more suited.
This is due to the fact that some atoms have unique electronic configurations that are not readily apparent from textual configurations.
How does electron configuration work?
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
What sort of electron arrangement would that look like?For instance: You can see that oxygen contains 8 electrons on the periodic table. These 8 electrons would fill in the following order: 1s, 2s, and finally 2p, according to the aforementioned fill order. O 1s22s22p4 would be oxygen's electron configuration.learn more about electronic configuration here
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HELPPPPPPPPPPPPPPPPPPPP
Answer:
See explanation
Explanation:
Turning on a flashlight: The chemical energy in the flashlight batteries is converted to electrical energy when the flashlight is turned on. The electrical energy is then converted to light (electromagnetic / radiant energy) and some thermal energy (little warmth from light in flashlight) by the light bulb. Chemical to Electrical to Light and Thermal
A Toaster: When electrical energy passes through the heating element in a toaster, it converts this electrical energy to thermal energy which helps to prepare toast. Electrical to thermal
Playing a violin: When the violin and the strings vibrate due to mechanical energy, it produces sound waves and sound energy. Mechanical to Sound
Nuclear power plant: Nuclear power plants use heat from fission to make steam that turns the turbine, creating mechanical energy. Mechanical energy turns the electric generator. Thermal to Mechanical
This is the process of separating a solid from a liquid by means of a porous material.
FILTRATION is the process of removing or "straining" a solid (the chemical term is precipitate) from a liquid by the use of filter paper or other porous material.
Question 1 (1 point)
How is atomic mass calculated?
O a
Ob
Oc
Od
Since the atomic mass is calculated as the sum of protons and neutrons, it is measured in amu. This is because protons and
neutrons each have a mass of 1 amu.
Since the atomic mass is calculated as the sum of neutrons, it is measured in amu. This is because neutrons have a mass of 1
amu.
Since the atomic mass is calculated as the sum of protons, it is measured in amu. This is because protons have a mass of 1
amu.
Since the atomic mass is calculated as the sum of protons and electrons, it is measured in amu. This is because protons and
electrons each have a mass of 1 amu.
Atomic mass calculated as the sum of protons and neutrons, it is measured in amu. This is because protons and neutrons each have a mass of 1 amu.
The sum of the masses of the protons, neutrons, and electrons in an atom or collection of atoms is known as the atomic mass. Since electrons are far lighter than protons or neutrons, the computation does not take their mass into account. A single atom's atomic mass is only its total mass, and it is usually given in atomic mass units, or amu.
Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom
For elements having isotopes relative atomic masses are taken in consideration. The relative atomic mass is an average of the atomic masses of all the different isotopes.
Example- The atomic mass of carbon atom - with six neutrons and 6 protons the atomic mass is 12 amu.
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Which characteristic of O₂ is correct?
O The molecular weight of O₂ = 16.
O One mole of O₂ weighs 16 g.
O The molecular weight of O₂ = 2 g.
O One mole of O₂ weighs 32 g.
PEN
FILTERN
(0) 1
PETE
Answer:
One mole of O₂ weighs 32 g
Explanation:
Which skill in the science process contains the units,number, and conversion?
The skill of Dimensional Analysis in the science deals with the conversion of units and numbers.
The physical quantities are only seven in basic. All the other quantities that we see are just derived quantities in one or the other.
While checking the correctness of a formula or while analyzing the reliability of an equation, we use dimensional analysis and convert the units into the dimension form.
Every fundamental quantity is given a Special notation like M for kg and L for meter.
Converting a bigger quantity into a smaller one is also a part of the dimensional analysis. As we know, we can measure the distance between our houses in meter but thing are different when it comes to astronomical distances.
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Help asap look at photo
According to Steno’s laws of Stratigraphy, the layers of rocks that are older according to the questions are A (Law of Cross-cutting relationships), D (Law of Cross-cutting relationships), D (Law of Original horizontality), J (Law of Superposition).
Geology and the Earth sciences have a discipline known as stratigraphy that focuses on layering (stratification) and rock layers (strata). It is mostly used towards the study of layered volcanic rocks and sedimentary rocks.
Stratigraphy examines the origin, makeup, and spread of these rock layers in addition to their organization and succession. Therefore, evaluating Time and Space is essential for the investigation of archaeological and natural stratification.
The patterns of rock layer deposition are described by Steno's laws of stratigraphy. Laws of superposition, original horizontality, cross-cutting relationships, and lateral continuity are the four laws.
The oldest layer in a succession of sedimentary rock layers is at the bottom, and the layers get younger as they move up the sequence, according to the law of superposition, a key stratigraphic concept.
According to the Law of Original Horizontality, all rock strata were initially deposited horizontally and are therefore susceptible to deformation. This enables us to deduce that for the rocks to be slanted, something must have occurred to them. This comprises quakes, faulting, and mountain-building activities.
According to the Law of Crosscutting Relationships, any faults or other rock bodies that cut through other rocks must be younger in age than the rocks they cut and displace.
According to the Law of Lateral Continuity, all rock strata are laterally continuous but subject to disruption or displacement due to subsequent events. When a stream or river erodes a section of the rock strata, this can occur.
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Explain how animals affect the water cycle as the breathe
Animals contribute to the water cycle mainly through breathing perspiration and the excretion of waste. Animals release water vapor when they exhale which contributes to the water vapor in the atmosphere. Sweat is also released through the pores which then evaporates to help cool their body down. Water is also excreted through urination as well as in their solid waste.
The position of animals within the water cycle is they launch water vapor once they exhale. explanation The water cycle suggests the non-stop motion of water within the earth and ecosystem. Liquid water evaporates into water vapor, condenses to shape clouds, and precipitates lower back to earth as rain and snow. Excretion is an essential part of the water cycle because it contributes to the quantity of water vapor in the air.
Humans and most animals excrete water by sweating, urinating, or defecating. The water molecules in those wastes can also evaporate and be a part of the water vapor suspended within the environment. cellular breathing performs a position inside the water cycle because it makes molecules of water from glucose and oxygen. The hydrogen inside the water molecule comes to form the glucose molecule, C6H12O6, even as the oxygen inside the water molecule comes from the oxygen fuel atom.
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quizletbi/o life carcin/o cancer cardi/o heart chem/o chemical cis/o to cut dermat/o skin enter/o small intestine gastr/o
bi/o life carcin/o cancer cardi/o heart chem/o chemical cis/o to cut dermat/o skin enter/o small intestine gastr/o stomach
What is Stomach ?The J-shaped organ that digests food is the stomach. It generates acids and enzymes, which are molecules that cause chemical reactions (digestive juices). Food is broken down by this mixture of enzymes and digestive juices so that it may move to your small intestine. A portion of the gastrointestinal (GI) tract includes your stomach.
Storing food and releasing it to the intestines at a pace that allows the intestines to process it is the stomach's primary job. In order to expand the food's surface area in preparation for digestion, the stomach mixes and grinds the food into a finely split chyme.Learn more about Stomach here:
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18.66 g of potassium react with water to produce potassium hydroxide and hydrogen gas. calculate the mass of potassium hydroxide produced.
The Total mass of potassium hydroxide produced is 26.76g
Potassium (K) has a mass of 18.66 g.
Potassium has a molar mass of 39.098 g/mol.
The mass molar mass of potassium (K) is 18.66 g per mole.
0.477 mol for 39.098 g/mol.
As a result, 0.477 mol of potassium (K) are involved in the water reaction.
This means that when 2 mol of K reacts with 2 mol of water, 2 mol of KOH is produced.
Therefore, 0.477 mol of KOH is produced when 0.477mol of K reacts with water.
As a result, 0.477 mol of potassium hydroxide (KOH) was generated in the given process.
KOH has a molar mass of 56.1056 g/mol.
KOH produced weighs (molar mass)×(molar number) = (0.477 mol)×(56.1056 g/mol) = 26.76g
26.76 grams of potassium hydroxide (KOH) were formed in the reaction as a result.
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Which type of
chemistry studies
non-carbon based
materials?
A. Analytical Chemistry
B. Organic Chemistry
C. Nuclear Chemistry
D. Inorganic chemistry
Inorganic chemistry is a type of chemistry studies non-carbon based materials
Organic chemistry is defined as the study of carbon-containing compounds, inorganic chemistry is the study of the remaining means not carbon-containing subset of compounds and inorganic chemistry focuses on structures that do not contain carbon and most commonly these structures include oxygen, silicon, aluminum, iron, calcium, sodium and magnesium and inorganic chemistry also studies synthesis, reactions, structures and properties of compounds
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Answer:
in organic chemistry is the type of non carbon based materials.
Explanation: it is a study of behavior and properties of in organic compounds which includes metals, minerals , compounds.
please answer question a and b please. i feel like they are wrong. thank you
select any and all processes that work by depositing powder layers and solidifying each layer with a laser.
Process that work by depositing powder layers solidifying each layer with a laser is selective laser sintering, direct metal laser sintering.
Direct metal laser sintering also called selective laser sintering is a type of metal additive manufacturing or 3D printing. selective laser sintering metal heat the metal powder until it fully melts into liquid but direct metal laser sintering does not melt the metal powder so in that direct metal laser sintering needed less energy.
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2 2. blood alcohol content (bac) is sometimes reported in weight-volume percent and, when it is, a bac of 0.10% corresponds to 0.10 g of ethyl alcohol per 100 ml of blood. in many jurisdictions, a person is considered legally intoxicated if his or her bac is 0.10%. suppose that a 68 kg person has a total blood volume of 5.4 l and breaks down ethyl alcohol at a rate of 10.0 grams per hour. how many 145 ml glasses of wine, consumed over three hours, will produce a bac of 0.10% in this 68 kg person? assume the wine has a density of 1.01 g/ml and 11.5% ethyl alcohol by mass. glasses of wine 3. which of these molecules are polar? select all that apply. insert letters without spaces in the answer box, example abcd. a. ascl5 b. of2 c. socl2 d. brf4 e. ch2cl2 f. if4-
The quantity of 145 ml glasses of wine, consumed over three hours, will produce a bac of 0.10% in this 68 kg person is 2.3 glasses of wine.
What is the quantity?Quantity is the measurement of something that is present. It can be liquid, gas, or solid.
In three hours, to produce a BAC of 0,10% for a 68kg person (5,4L blood) you need to consume:
10 g of ethyl alcohol / 100 ml of blood x 5400 ml of blood + 10.0 g/h = 30.54g of ethyl alcohol
Assuming a 11,6% (v/v) of wine Where density of ethyl alcohol is 0,789 g/mL
30.54g of ethyl alcohol x 1ml ethanol / 0.789 x 100 ml wine/ 1.6 ml ethanol = 333.7 mL wine
333.7 mL wine / 145 ml = 2.3 glass of wine
Thus, the person needs to consume 2.3 glasses of wine.
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How many electrons are there in a fluorine
(F) atom?
Answer: depends on the charge.
Explanation:
Let's say you have 9 protons and a charge of -2. Your amount of electrons would be 2 larger than that of your protons. The more electrons, the more negatively charged your atom is.
If there is no charge given or electrons listed, your number of protons (atomic number) will be the same as your number of electrons. In this case, there are 9 protons and 9 electrons.
This might not help, but if you're given no information about charge or electrons, your charge is 0 and you're automatically forced to assume that your number of protons is equal to that of your amount of electrons.
When iron(III) oxide is heated in blast furnace with carbon monoxide, iron metal and carbon dioxide is produced. What is the mass of iron(III) oxide necessary (in grams) to form 750.0 kg of iron? How much carbon dioxide (in grams) is released in this process?
Answer:
Reaction of Iron(III) oxide (Fe2O3) with carbon monoxide (CO) to form iron (Fe) and carbon dioxide (CO2), is a redox reaction as both oxidation of carbon monoxide and reduction of iron is taking place. The equation can be written as: Fe2O3+3CO→2Fe+3CO2.
Explanation:
If i titrated 2g of a NaHCo3+NaCo3 mixture with 1.0 Hcl how can I calculate for the percent composition of NaHCo3/NaCo3 in the mixture
The percentage composition of [tex]NaHCO_{3}[/tex] in the mixture on titration with mixture with 1.0 HCl is 26.5%
What is Titration ?
"The process of calculating the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" is the definition of titration.
However, redox titration and acid-base titration are the two most typical titration types used in quantitative chemical analysis.
Titration Methods:Titrations of acid and base.oxidative titrationsTitrations of precipitationTitrations using complex metrics[tex]NaHCO_{3}[/tex] + HCl → NaCl + [tex]H_{2} O[/tex] + [tex]CO_{2}[/tex]
( 23+1+12+48 ) (1+35.5)
=84 g =36.5g
HCl consumed when used with [tex]NaHCO_{3}[/tex]
[tex]\frac{36.5}{84}[/tex] x 0.63
= 0.2737 g
HCl in millimoles used with the mixture that is given by the equation;
= molarity x Volume in mL
[tex]\frac{1}{10}[/tex] x 150 =15
HCl weight consumed with the mixture is given by the equation;
= millimoles x mol.wt x [tex]10^{-3}[/tex]
= 15 x [tex]10^{-3}[/tex] x 36.5
= 0.5475g
So, the total HCl = HCl consumed when used with [tex]Na_{2} CO_{3}[/tex] + HCl consumed when used with [tex]NaHCO_{3}[/tex] .
0.5475 = [tex]\frac{75}{106}[/tex] X y + 0.2737
y = 0.3975
percentage of [tex]Na_{2} CO_{3}[/tex] in the mixture:
=[tex]\frac{0.3975}{15}[/tex] x 100
= 26.5%
Hence, The percentage composition of [tex]NaHCO_{3}[/tex] in the mixture on titration with mixture with 1.0 HCl is 26.5%.
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why is direct nucleophilic substitution of an alkyl halide with nh3 not a very useful method for preparing primary amines?
This is so because extra 2° and 3° alkyl amine can be created by the nucleophilic action of the primary amine that is formed by ammonolysis.
Ammonia reacts as nucleophile with alkyl halides to give primary amines in neuclophilic substitution reaction. The primary amine produced can also interact with the alkyl halide to produce a disubstituted amine, which can then interact with another substance to produce a trisubstituted amine.Yield is often poor because primary amine R-NH2 itself is a nuclophile and can react with more alkyl halides. So the result or product obtained contain secondary, tertiary, quaternary ammonium salts. we can avoid this problem by using excess amount of ammonia in the reaction.Alkylation of ammonia results in a variety of compounds as a result. Therefore, it cannot be considered as very useful method for preparing Primary amines.
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concentrated hydrochloric acid is 38.0% hci by mass, and it has a density of 1.189 g/ml at 20°c. the density of water at 20°c is 0.9982 g/ml.
739 ml volume of water would remain
Stepsvolume of solution = 1Litre = 1000 ml
density of solution = 1.189 g/ml
mass of solution = volume of solution × density of solution
= 1000 × 1.189 = 1189 g
conc of HCL is 38% by weight.
so, mass of HCL in 1189g of solution = 38% of 1189 = 451.82g
mass of H2O in solution = mass of solution - mass of HCl
= 1189g - 451.82g
= 737.18g
volume of H2O = mass of H2O/density of H2O
= 737.18/0.9982 ml
=739 ml volume of water would remain.
Hydrochloric acid A colourless to yellowish, smelly liquid, concentrated hydrochloric acid (36.5-38.0%) with a strong smell. Muriatic acid is another name for hydrochloric acid. Though extremely corrosive, it is not flammable. Benzene, alcohol, and water soluble. It is a serious skin and eye irritant, and breathing in the fumes can be dangerous.learn more about hydrochloric acid here
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the question you are looking for is
Concentrated hydrochloric acid is 38% HCl by mass, and it has a density of 1.189 g/ml at 20 celsius. The density of water at 20 celsius is 0.9982 g/ml. If all the HCl were somehow removed from 1.000 liters of this solution at 20 celsius, what volume of water would remain?
The komodo dragon prefers to hunt by stealth, but can briefly run 6.5 miles for half an hour. What is the average speed in miles per hour?
The average speed in miles per hour, given the data is 13 miles per hour
What is speed?Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
What is average speed?This is the total distance travelled divided by the total time taken to cover the distance.
Average speed = total distance / total time
How to determine the average speedThe following data were obtained from the question:
Total distance = 6.5 mileTotal time = 1/2 hour = 0.5 hourAverage speed =?The average speed can be obtained as follow:
Average speed = total distance / total time
Average speed = 6.5 / 0.5
Average speed = 13 miles per hour
Thus, the average speed is 13 miles per hour
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What is the initial source
of the energy you exhibit when you run?
Analyze the energy transformations that
occur during this process, from start to finish.
Express your analysis as a flow chart. Include
any details needed to explain the energy
transformations.
Running requires the body to transform potential energy into kinetic energy. A system's internal energy is known as its potential energy. When a system moves horizontally using kinetic energy, potential energy is consumed.
Potential energy is conserved as chemical energy in the human body. The food that a person eats during the day provides the chemical energy. The body requires a specific number of calories, or the energy from food, to carry out specific tasks. The runner will run out of potential energy and weary if they have not consumed enough calories during the day. This is due to the body's poor capacity for storing energy. Although energy cannot be created or destroyed, it may move. The majority of the person's stored energy is released as thermal energy while they run.
The impact of the runner's foot on the ground causes sound waves to be emitted, which releases energy from the runner's body. Every stride a runner takes releases energy from their body, thus it's critical for them to eat adequate chemical energy in the form of calories before their run. The body of the runner need a significant number of calories as a reserve so that they will have more energy to burn as their stored energy is released during the run.
The body is not particularly effective at preserving this energy when it uses the calories it has already consumed. The heat (thermal energy) that the body emits when it transforms its stored (potential) chemical energy into kinetic energy causes around 75% of the chemical energy that the runner has ingested to be wasted as the leg muscles contract to propel the runner forward. The flow chart is attached below.
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When mercury oxide is heated, it decomposes into mercury and oxygen. If 28. 4 g of mercury oxide decomposes, producing 2. 0 g of oxygen, what is the percent by mass of mercury in mercury oxide?.
The percent by mass of mercury in mercuric oxide is
93 %.
The formula of mercuric oxide is HgO. When mercury combines with oxygen, then mercuric oxide is formed.
The molecular mass of mercury oxide is 216 g/mol. Its melting point is 500°C.
The balance equation for the reaction of decomposition of mercury oxide is,
[tex]2HgO (s)→ 2Hg (l) + O _{2}(g)[/tex]
Mass of mercury oxide = 28.4 g
Mass of the oxygen = 2 g
The percent by mass of mercury in mercury oxide is,
[tex]Mass ℅= \frac{Mass \: of \: Mercury }{Mass \: of \: Mercury \: oxide} \times 100[/tex]
[tex] = \frac{28.4 - 2}{28.4} \times 100[/tex]
= 93 %
Therefore, the percent by mass of mercury in mercury oxide is 93 %.
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(HURRY 20 A student scoops some ocean water into a cup. He claims that it is not a mixture, because he doesn't see different components in the cup. Explain to this student why the cup of ocean water IS a
mixture. Use the proper term (heterogeneous or homogeneous) to describe the mixture as part of your explanation.
The ocean water contains a mixture of salt and other larger impurities, as well as a mixture of several gases.
What is a mixture?A mixture is a material composed of two or more different chemical substances that are not chemically bonded.
The natural waters salt and other larger impurities, and even a variety of gases. This is classified as a heterogeneous mixture due to larger impurities, whereas some is classified as a homogeneous mixture due to a mixture of several gases and salt.
Thus, the mixture can be said to be heterogenous one.
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Why is it important for an organism to have both strong bonds (covalent and ionic) and weak interactions (van der Waals forces)?
Both strong bonds (covalent and ionic) and weak interactions (van der Waals forces) are important in the function of chemical molecules in an organism.
What are the interactions in living organisms?Now we know that organisms have various kinds of chemical interaction within them. These different kinds of interactions are responsible for the diverse properties we see in the organisms.'
Let us take the DNA molecule for instance, the atoms that compose the bases in the DNA molecule are all held together by covalent interactions. These are strong bonds.
On the other hand, the secondary structure of the DNA molecule owes to the hydrogen bonds and van der Waals forces that occur between the complimentary base pairs that we find in the DNA molecule.
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The label on the car's antifreeze container claims to protect the car between -30°C and 130°C. To covert Celsius temperature to Fahrenheit temperature, the formula C=5/9(F-32). Write a compound inequality to determine the Fahrenheit temperature range at which the antifreeze protects the car.
The compound inequality to determine the Fahrenheit temperature range at which the antifreeze protects the car would be as follows
−30 < 5/9 (F − 32) < 130 or −22 < F < 266
Let us assume that the temperature in degrees Fahrenheit, up to which the antifreeze protects the car is represented by F.
It is given in the question that the formula to convert Celsius temperature to Fahrenheit temperature is,
C = 5/9(F-32), where C is the temperature in Degrees Celcius at which the antifreeze protects the car.
According to the question, C must be between -30°C and 130°C.
-30 < C' < -130
Put in the values, we get
-30 < 5/9(F-32) < -130
Now C = 5/9(F-32)
So, F - 32 = 9/5C
F = 9/5C+ 32
Thus, -30° in degree Fahrenheit = 9/5(-30) +32 = -54 + 32 = -22
And, 130° in degree Fahrenheit = 9/5(130) +32 = 234 + 32 = 266
Therefore, -30 < 5/9(F-32) < -130 and also be written as −22 < F < 266.
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Upon combustion, a 1.2743 g sample of a compound containing only carbon, hydrogen, and oxygen produces 3.2007 g CO2 and 0.9827 g H2O. Find the empirical formula of the compound.
The answer would be C8H12O2.
Here is the equation with masses :
1.2743 g CaHbOc + (3.2007 g + 0.9827 g - 1.2743 g) O2 ------> 0.9827 g H2O + 3.2007 g CO2
We are using 32.00 g/mol for O2
We are using 18.03 g/mol for H2O
We are using 44.01 g/mol for CO2
We don't know molecular mass of Hydrocarbon so we permit a,b and c to be any positive real number.
CaHbOc + 2.9091 g / 32.00 g/mol O2 ----> 0.9827 g/ 18.03 g/mol H2O + 3.2007 g/ 44.01 g/mol CO2
Now, calculate the above division
CaHbOc + (0.0909 mol) O2 -------> (0.0545 mol) H2O + (0.0727 mol) CO2
Matching coefficient we get
a = 0.0727
b = 2 * 0.0545 = 0.109
c = 0.0545 + 2*0.0727 - 2*0.0909
= 0.0181
Divide every number by 0.0181
a / 0.0181 = 0.0727/ 0.0181 = 4.01
b / 0.0181 = 0.109/0.0181 = 6.02
C / 0.0181 = 0.0181 / 0.0181 = 1
Multiply over number by 2
a = 4.01 * 2 = 8.02 ~ 8
b = 6.02 * 2 = 12.04 ~ 12
c = 1 * 2 = 2
Now putting these values we get C8H12O2.
The chemical name of the C8H12O2 is 2-Octynoic acid
Hence the empirical formula of the compound is C8H12O2.
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