Question 2
1 pts
What is the molar mass of Cr2(SO4)3?
O 148.1 g
0 288.0 g
O 344.2 g
0 392.2 g
200.0 g

Answers

Answer 1

Answer:

392g

Explanation:

The given compound is;

         Cr₂(SO₄)₃

To find the molar mass, we sum the atomic masses of the elements in the compounds together.

Atomic mass of Cr  = 52

                           S  = 32

                            O  = 16

So;

 Molar mass  = 2(52) + 3[32 + 4(16)]  = 392g/mol


Related Questions

What is the missing word in the word equation below?
sodium hydrogencarbonate → carbon dioxide + water +

Answers

Answer:

sodium carbonate

Explanation:

Sodium hydrogen carbonate (also known as sodium bicarbonate or bicarbonate of soda) has the chemical formula NaHCO3. When it is heated above about 80°C it begins to break down, forming sodium carbonate, water and carbon dioxide. This type of reaction is called a thermal decomposition.

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what is the chemical formula for Sulphate...​

Answers

Answer:

SO4²

Explanation:

Formula and structure: The sulfate ion formula is SO42- and the molar mass is 96.06 g mol-1. This salt is formed by one sulfate center to which 4 atoms of oxygen are attached, 2 of these atoms are forming S=O.

Answer:

[tex]so _{4} ^{2 - } [/tex]

Explanation:

sulfate is consisting of sulfur element with 4 oxygen as the structure in the pic given and this group is 2- charged

After attending his cousin's birthday party in his backyard, Michael forgot his balloon outside when he went to bed. Overnight, the temperature dropped significantly. When Michael saw the same balloon the next morning, it looked different. Why did this happen?

Answers

Answer:

See explanation

Explanation:

You see, we must cast our minds back to Charles' law. Charles' law gives the relationship between the volume of a gas and temperature of the gas.

Now, Micheal left the balloon outside at a particular temperature and volume the previous night. Overnight, the temperature dropped significantly and so must the volume of the gas in the balloon!

Remember that Charles' law states that, the volume of a given mass of gas is directly proportional to its absolute temperature at constant pressure. Since the pressure was held constant, the drop in the volume of gas in the balloon can be accounted for by the drop in temperature overnight.

Which of the following is a precipitate in the reaction below?
AgNO3 (aq) + NaCl (aq)
AgCl (s) + NaNO3 (aq)
Osodium nitrate
O silver chloride
O sodium chloride
O silver nitrate

Answers

Answer:

sodium chloride + silver nitrate = silver chloride

Explanation:

i believe this is correct, hope it helps :)

How many total "elements" are in the chemical equation?
H2 + O2 + H2 → H2O + H2O

1
6
12
2

Answers

Answer:

Two elements

Hydrogen and Oxygen

Give an example of a chemical reaction during which a single substance breaks
down. *

Answers

Answer:

2NaCl(l) => 2Na(s) + Cl₂(g)

Explanation:

Electrolysis of melt NaCl to form sodium (Na) metal and chlorine (Cl₂) gas.

This is a class of reaction called 'Decomposition Rxns'. For what it's worth, there are 6 distinct compound types that undergo breakdown by decomposition. The acronym C O A C H E can help remember them.

C - Carbonates => CaCO₃(s) => CaO + CO₂

O - Oxides of Metals => 2Fe₂O₃(s) => 4Fe°(s) + 3O₂(g)

A - Acids (Oxoacids) => H₂CO₃(aq) => CO₂(g) + H₂O(l)

C - Chlorates, Bromates & Iodates => 2KClO₃(s) => 2KCl(s) + 3O₂(g)

H - Hydroxides => Ca(OH)₂(s) => CaO(s) + H₂O(l)

E - Electrolysis => see above electrolysis of NaCl(l)

Answer:

2NaCl(l) => 2Na(s) + Cl₂(g)

Explanation:

Which kind of energy change occurs when a candle is burning

Answers

Answer:

2 Answers. This would be chemical energy that is converted to heat. The heat from the wick melts the wax which gets absorbed in the wick and then gets burnt (which is really oxidation) to produce heat energy as well as light energy.

Explanation:

A candle must undergo a chemical reaction in order to burn, producing heat and light. As a result, energy changes from chemical energy to heat and light energy. As a result, as a candle burns, chemical energy is transformed into heat and light energy.

What is chemical energy ?

Chemical energy is the energy that is released when chemical substances engage in a chemical reaction and change into other substances. Batteries, food, and gasoline energy are some instances of chemical energy storage media.

A type of potential energy associated with the structural organization of atoms or molecules is known as chemical potential energy. Chemical connections or interactions between molecules may have led to this configuration.

They are broken down into simpler molecules, such as glucose and amino acids, which are then either reassembled and stored in various forms, such as glycogen, or consumed as energy. Chemical energy in food is essential for giving our bodies the fuel they require to keep us alive and active.

Thus, energy changes from chemical energy to heat and light energy.

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Please help me! U will get a 30 points!

Answers

Answer:

C

Explanation:

The stem and leaves need sunlight to undergo photosynthesis, they will grow in such a way until they receive some sunlight.

Increasing the temperature of a given amount of gas at constant volume causes the pressure to increase because _____. there is less space where the molecules can move around there are more molecules the molecules are striking a larger area with less force the molecules are moving more quickly

Answers

Answer:

the molecules are moving more quickly

Explanation:

The  relationship between temperature and pressure is explained using the kinetic theory of matter.

As the temperature of the gas is increased, the molecules have a greater kinetic energy. This increased energy of the gas molecules make the collision between the molecules and with the walls of the container more rapid.

The correct option is;

the molecules are moving more quickly

A student decides to dissolve crackers in their soup as fast as possible. They must first increase the surface area of the crackers. How could this be done? a.Break the crackers into pieces b.Pile the crackers on top of each other c.Wrap the crackers in plastic to keep them fresh d.Put crackers in the bottom of the bowl

Answers

Answer: The correct option is A ( Break the crackers into pieces.)

Explanation:

The rate of reaction between two substances can be affected by the following factors:

--> surface area of reacting substances

--> concentration

--> reaction mechanism

--> temperature

--> the presence of a catalyst and

--> pressure ( if gaseous)

Reagents in solution tend to react faster than reagents in solid form. This is because molecules are freer to move about and collide more effectively in solutions. For example, a lump of zinc will not react as fast as powdered zinc with dilute hydrochloric acid to produce hydrogen. This is the same with the reaction between the crackers and soup. To increase the reaction of the substances, the crackers needs to be broken into pieces(thus,increased surface area)

I will need help plz thank you

The Earth's surface is _____ water.

50 %

71 %

97 %

Answers

Answer:

71%

Explanation:

71% explanation: About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog. Water is never sitting still.

What does it mean for energy to be conserved

Answers

Answer: It means that the energy is being stored or preserved to be used at a later time.

Your question was a little vague, so if this isn't the answer you were looking for, just let me know and I'll fix it.

Hope this helps! Good luck! :D

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Water stored in snow and ice can return directly to the atmosphere through the process of sublimation.

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Please select the best answer from the choices provided


T

F

Answers

I believe the answer is true:)
i think it’s true!! not sure

Which factor plays the most important role in allowing this reaction to occur?

Answers

The production of water proceeds according to the following equation.

If 11 grams of a gas occupies 5.6 liters at STP, what is its gram molecular mass?

Answers

The molecular mass of gas = 44 g/mol

Further explanation

Given

5.6 Liters of gas

11 gram of gas

Required

The molecular mass

Solution

STP = Standart Temperature and Pressure , 1 atm 273 K

At STP , 1 mol gas = 22.4 L

So mol of 5.6 Liters gas :

= 5.6 : 22.4

= 0.25 moles

The molecular mass of gas :

= mass : mol

= 11 g : 0.25 moles

= 44 g/mol

what is the empirical formula 63.0 g Rb and 5.90 g O.

Answers

Answer:

Explanation:

1st convert given data into % per 100wt...

Total system mass = 63.0g + 5.90g = 68.9g

%Rb = 63.0g/68.9g x 100% = 91.4% per 100wt

%O  =  5.9g / 68.9g x 100% = 8.6%

Then follow the following sequence of calculations...

% => grams => moles => mole ratio => reduce to smallest whole no ratio => empirical ratio => empirical formula

%Rb = 91.4% => 91.4g/ 85.5g·mol⁻¹ =>1.069mole

%O  =   8.6% =>  8.6g/16g·mol⁻¹ => 0.5375mole

Rb:O => 1.069 : 0.5375

Reduce by dividing by the smaller mole value

1.069/0.5375 : 0.5375/0.5375 => 2 : 1 <=> empirical ratio

∴ Empirical Formula => Rb₂O

What is the percentage composition for H2O in this compound Al(OH)3.2H2O?

a
50.55%
b
40.05%
c
32.73 %
d
65.09%

Answers

Answer:

32.73%

Explanation:

To solve this problem, first find the molar mass of Al(OH)₃.2H₂O

 Atomic mass of Al  = 27g/mol

                            O = 16g/mol

                            H  = 1g/mol

Molar mass = 27 + 3(16 + 1) + 2(2(1) + 16)

                    = 27 + 51 + 36

                   = 114g/mol

Percentage composition  = [tex]\frac{36}{114}[/tex] x 100 = 32.73%

The first mass extinction that occurred between the Paleozoic and the Mesozoic Era,
caused the extinction of which organism?
O Wooly mammoth
O Dinosaurs
O Trilobites
Flying Reptiles

Answers

Answer:

O Trilobites

Explanation:

The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.

Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.

The first mass extinction took place between the Paleozoic and the Mesozoic era. This wiped out one of the most successful organism on the earth surface at that time. They were the trilobites.

What is the molar mass of carbon (C)?

Answers

The molar mass of carbon (C) is 12.0107 u.

Answer:

Explanation:

The answer is 12.0107 u

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Answers

Answer:

Friction of wind against the ocean surface

friction of wind against the ocean surface

3. A chemical reaction produces 3.81g potassium chloride (KCI). How many formula units of potassium chloride are there?* Find molar mass of KCI* Answer:__3.08 E 22 formula units of KCI​

Answers

Answer:

3.81 [tex]\frac{1}{74.55}[/tex] X [tex]\frac{6.02*10^{23} }{1}[/tex] = 3.08 X 10^22

Explanation:

74.55 is the mass

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Answers

Answer:

1. Hydrogen gas react with nitrogen gas to produce ammonia.

2. Phosphorus react with oxygen to produce phosphorus pentoxide

3. Iron react with water to produce hydrogen gas and Iron(III) oxide

4. Aluminum react with chlorine to produce aluminum chloride.

5. Zinc sulphide react with oxygen to produce Zinc(II) oxide and Sulphur dioxide

Explanation:

1. H₂ + N₂ —> NH₃

H₂ => Hydrogen

N₂ => Nitrogen

NH₃ => Ammonia

The word equation is:

Hydrogen gas react with nitrogen gas to produce ammonia.

2. P₄ + O₂ —> P₂O₅

P₄ => Phosphorus

O₂ => Oxygen

P₂O₅ => Phosphorus pentoxide

The word equation is:

Phosphorus react with oxygen to produce phosphorus pentoxide

3. Fe + H₂O —> H₂ + Fe₂O₃

Fe => Iron

H₂O => water

H₂ => Hydrogen gas

Fe₂O₃ => Iron(III) oxide

The word equation is:

Iron react with water to produce hydrogen gas and Iron(III) oxide.

4. Al + Cl₂ —> AlCl₃

Al => Aluminum

Cl₂ => Chlorine gas

AlCl₃ => Aluminum chloride

The word equation is:

Aluminum react with chlorine to produce aluminum chloride.

5. ZnS + O₂ —> ZnO + SO₂

ZnS => Zinc sulphide

O₂ => Oxygen

ZnO => Zinc(II) oxide

SO₂ => Sulphur dioxide

The word equation is:

Zinc sulphide react with oxygen to produce Zinc(II) oxide and Sulphur dioxide

How many grams of C3H8 are in a 7 L tank at 293 K and 5.45 atm?

Answers

1.59 moles















































112211111111111112

what can an increase in energy do to a solid?

Answers

The energy will be transferred from the warmer object to the freezing object .

How do we view large areas of earth’s surface?

Answers

Answer: Are there options? I think the answer is continents, but I don't really understand the question. Is continents an option?

Explanation:

If the object floats in water, is its density lower or higher?

Answers

Answer:

Its has a lower density. Think about it, a ship in the water is long because if it wasn't it would have a higher density and sink. The ship needs to diperse its weight across the water to make it less dense.

Explanation:

Your welcome! Have a great day!

Many human activities result in carbon dioxide emissions.
Our carbon footprint is a measure of how much carbon dioxide we each cause to be produced.
(a) Why should we be concerned about our carbon footprint?
(b) Most power stations in the UK burn coal.
Coal was formed from tree-like plants over millions of years.
Suggest why burning wood instead of coal would help to reduce our carbon footprint.

Answers

Answer:

: the average human-driven CO2 emissions per year climbed 1.4%

every household makes about 7 tons worth of Co2

A C02 footprints are produced at such high rates and hurts plants and the environment

B coal is a very inexpensive and efficient way to generate electricity. Since its a large quantity of them which still produces alot co2  unlike wood, burning wood doesn't  produce as much but it's much harder to ignite and get to last because it takes coal almost 100 degrees and wood takes about 700 degrees

A compound whose empirical formula is NO₂ could have a molecular mass of? 23 g/mol 39 g/mol 92 g/mol 120 g/mol

Answers

Dobt know sorry for it sorry

The molecular formula of a compound gives the actual number of atoms of various elements present in one molecule of the compound. The molecular mass is 92 g/mol. The correct option is C.

What is empirical formula?

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

The molecular formula of a compound is a whole number multiple of its empirical formula.

Molecular formula = n × Empirical formula

The value of 'n' can be obtained from the relation:

n = Molecular mass / Empirical formula mass

Here the value of n = 2. Then,

Molecular mass = n × Empirical formula mass

Empirical formula mass of NO₂ = 45.8 g

2 × 45.8 = 91.6 ≈ 92 g/mol

Thus the correct option is C.

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4. Calculate the molar mass of Fe2(SO4)3. Then calculate the mass of iron(III) sulfate of 4.05X1023 formula units. Answer: __269g Fe2(SO4)3_​

Answers

Answer:

399.88 [tex]\frac{4.05*10^{23} }{6.022*10^{23} }[/tex] =269

Explanation:

399.88 is the molar mass of iron(III) sulfate.

The mass of 4.05 × [tex]10^{23[/tex] formula units of Fe2(SO4)3 is approximately 6.48 × [tex]10^{25[/tex] grams.

Mass from formula units

To calculate the molar mass of Fe2(SO4)3, we need to determine the atomic masses of the individual elements involved and multiply them by their respective subscripts:

Fe: 55.845 g/mol (atomic mass of iron)S: 32.06 g/mol (atomic mass of sulfur)O: 16.00 g/mol (atomic mass of oxygen)

Fe2(SO4)3 consists of 2 iron atoms, 3 sulfur atoms, and 12 oxygen atoms:

Molar mass of Fe2(SO4)3 = (2 * 55.845) + (3 * 32.06) + (12 * 16.00) = 159.69 g/mol

To calculate the mass of 4.05 × 10^23 formula units of Fe2(SO4)3, we can use the molar mass:

Mass = (4.05 × 10^23) * (159.69 g/mol) = 6.48 × 10^25 g

Rounded to two decimal places, the mass of 4.05 × [tex]10^{23[/tex] formula units of Fe2(SO4)3 is approximately 6.48 × [tex]10^{25[/tex] grams.

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Sally is building a list of the types of matter that have energy. She includes liquids on her list because she can see that liquids flow. Is her list complete?

a. yes, her list with just liquids on it is complete
b. no, she should add only gases to her list
c. no, she should add only solids to her list
d. no, she should add gases and solids to her list

Answers

Answer:

I just looked up the types of matter energy has.

Explanation:

I believe the answer is D.

Sally's list of matter that have energy is not complete as all the types of matter have energy as all matter have mass , and mass and energy are related, so she should have added gases and solids to her list.

What is matter?

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of the  same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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