Question 1

When 10.0 g of NH₃ reacts, the actual yield of N2 is 8.50 g. What is the percent yield? 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

Accepted Answer

A) 85.0% 
B) 51.5% 
C) 20.6% 
D) 41.3% 
E) 8.5% 
A) 85.0% 
B) 51.5% 
C) 20.6% 
D) 41.3% 
E) 8.5%

Question 2

For the question(s) that follow, consider the following equation.
2Mg + OS1U1B12S1U1B0 → 2MgO
-The number of moles of MgO produced when 0.20 mole of O2 reacts completely is

Accepted Answer

A) 0.10 mole. 
B) 0.20 mole. 
C) 0.40 mole. 
D) 0.60 mole. 
E) 0.80 mole. 
A) 0.10 mole. 
B) 0.20 mole. 
C) 0.40 mole. 
D) 0.60 mole. 
E) 0.80 mole.

Question 3

Barium chloride and sodium sulfate react according to the following equation.
BaCl₂ + NaS1U1B12S1U1B0SO₄ → BaSO₄ + 2NaCl
Answer the question(s) that follow about this reaction.
-How many moles of barium sulfate are produced from 0.100 mole of barium chloride?

Accepted Answer

A) 0.0100 mole 
B) 0.100 mole 
C) 0.200 mole 
D) 1.00 mole 
E) 2.00 moles 
A) 0.0100 mole 
B) 0.100 mole 
C) 0.200 mole 
D) 1.00 mole 
E) 2.00 moles

Question 4

How many grams of CO2 are produced from 125 g of O2 and excess CH₄ ?
 CH₄ + 2O2 → CO2 + 2H2O

Accepted Answer

A) 125 g of CO2 
B) 62.5 g of CO2 
C) 172 g of CO2 
D) 85.9 g of CO2 
E) 250. g of CO2 
A) 125 g of CO2 
B) 62.5 g of CO2 
C) 172 g of CO2 
D) 85.9 g of CO2 
E) 250. g of CO2

Question 5

The following reaction is balanced. KClO₃ → KCl + O2

Accepted Answer

A) True 
 B)False

Question 6

When 60.0 g of CH₄ reacts with excess O2, the actual yield of CO2 is 112 g. What is the percent yield? CH₄ + 2O2 → CO2 + 2H2O

Accepted Answer

A) 53.6 % 
B) 187 % 
C) 67.9 % 
D) 46.4 % 
A) 53.6 % 
B) 187 % 
C) 67.9 % 
D) 46.4 %

Question 7

The mass of one mole of water is 18.0 g.

Accepted Answer

A) True 
 B)False

Question 8

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 
2H2 + O2 → 2H2O

Accepted Answer

A) 0.100 g 
B) 0.180 g 
C) 0.200 g 
D) 2.00 g 
E) 4.00 g 
A) 0.100 g 
B) 0.180 g 
C) 0.200 g 
D) 2.00 g 
E) 4.00 g

Question 9

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H2

Accepted Answer

single rep

Question 10

What is the molar mass of sodium phosphate, Na3PO₄ ?

Accepted Answer

A) 119 g 
B) 308 g 
C) 164 g 
D) 226 g 
E) 354 g 
A) 119 g 
B) 308 g 
C) 164 g 
D) 226 g 
E) 354 g

Question 11

Calculate the molar mass of potassium chloride, KCl.

Accepted Answer

A) 74.6 g 
B) 54.5 g 
C) 6.74 g 
D) 67.4 g 
E) 19.0 g 
A) 74.6 g 
B) 54.5 g 
C) 6.74 g 
D) 67.4 g 
E) 19.0 g

Question 12

Any reaction that absorbs 150 kcal of energy can be classified as

Accepted Answer

A) endothermic. 
B) exothermic. 
C) activated. 
D) reduction. 
E) oxidation. 
A) endothermic. 
B) exothermic. 
C) activated. 
D) reduction. 
E) oxidation.

Question 13

The following is a decomposition reaction. 2KClO₃ → 2KCl + 3O2

Accepted Answer

A) True 
 B)False

Question 14

Pentane (CS1U1B15S1U1B0HS1U1B112S1U1B0) reacts with oxygen (OS1U1B12S1U1B0) to form carbon dioxide (COS1U1B12S1U1B0) and water (HS1U1B12S1U1B0O) according to the following reaction. Answer the question(s) that follow about this reaction.
CS1U1B15S1U1B0HS1U1B112S1U1B0 + ? OS1U1B12S1U1B0 → ? COS1U1B12S1U1B0 + ? HS1U1B12S1U1B0O
-What is the coefficient for carbon dioxide in the balanced equation?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 6 
E) 8 
A) 2 
B) 4 
C) 5 
D) 6 
E) 8

Question 15

Acetylene gas, C2H2, reacts with oxygen according to the following equation. If 1.00 mole of acetylene reacts completely with sufficient oxygen, how many moles of carbon dioxide are produced? 2C2H2 + 5O2 → 4CO2 + 2H2O

Accepted Answer

Question 16

How many moles of iron are present in 3.15 × 1024 atoms of iron?

Accepted Answer

A) 5.23 moles 
B) 1.90 moles 
C) 292 moles 
D) 0.523 moles 
E) 1.90 × 1048 moles 
A) 5.23 moles 
B) 1.90 moles 
C) 292 moles 
D) 0.523 moles 
E) 1.90 × 1048 moles

Question 17

The molar mass of C3H8O2 is

Accepted Answer

A) 76.0 g. 
B) 60.0 g. 
C) 29.0 g. 
D) 69.0 g. 
E) 52.0 g. 
A) 76.0 g. 
B) 60.0 g. 
C) 29.0 g. 
D) 69.0 g. 
E) 52.0 g.

Question 18

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O₃ produced? 
4Fe(s) + 3O2 (g) → 2Fe2O₃(s)

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 19

Find the mass of AlCl₃ that is produced when 25.0 grams of Al2O₃ react with excess HCl according to the following equation. 
Al2O₃(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H2O(l)

Accepted Answer

A) 155 g 
B) 72.9 g 
C) 65.4 g 
D) 32.6 g 
E) 16.3 g 
A) 155 g 
B) 72.9 g 
C) 65.4 g 
D) 32.6 g 
E) 16.3 g

Question 20

In an oxidation-reduction reaction, the substance oxidized always

Accepted Answer

A) takes on oxygen atoms. 
B) shows a loss of electrons. 
C) gives up hydrogen atoms. 
D) shows a gain of electrons. 
E) becomes a charged species. 
A) takes on oxygen atoms. 
B) shows a loss of electrons. 
C) gives up hydrogen atoms. 
D) shows a gain of electrons. 
E) becomes a charged species.

Exam 7: Chemical Reactions and Quantities

When 10.0 g of NH₃ reacts, the actual yield of N2 is 8.50 g. What is the percent yield? 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

For the question(s) that follow, consider the following equation. 2Mg + O2 → 2MgO -The number of moles of MgO produced when 0.20 mole of O2 reacts completely is

Barium chloride and sodium sulfate react according to the following equation. BaCl₂ + Na2SO₄ → BaSO₄ + 2NaCl Answer the question(s) that follow about this reaction. -How many moles of barium sulfate are produced from 0.100 mole of barium chloride?

How many grams of CO2 are produced from 125 g of O2 and excess CH₄ ? CH₄ + 2O2 → CO2 + 2H2O

The following reaction is balanced. KClO₃ → KCl + O2

When 60.0 g of CH₄ reacts with excess O2, the actual yield of CO2 is 112 g. What is the percent yield? CH₄ + 2O2 → CO2 + 2H2O

The mass of one mole of water is 18.0 g.

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H2 + O2 → 2H2O

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H2

What is the molar mass of sodium phosphate, Na3PO₄ ?

Calculate the molar mass of potassium chloride, KCl.

Any reaction that absorbs 150 kcal of energy can be classified as

The following is a decomposition reaction. 2KClO₃ → 2KCl + 3O2

Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the question(s) that follow about this reaction. C5H12 + ? O2 → ? CO2 + ? H2O -What is the coefficient for carbon dioxide in the balanced equation?

Acetylene gas, C2H2, reacts with oxygen according to the following equation. If 1.00 mole of acetylene reacts completely with sufficient oxygen, how many moles of carbon dioxide are produced? 2C2H2 + 5O2 → 4CO2 + 2H2O

How many moles of iron are present in 3.15 × 1024 atoms of iron?

The molar mass of C3H8O2 is

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O₃ produced? 4Fe(s) + 3O2 (g) → 2Fe2O₃(s)

Find the mass of AlCl₃ that is produced when 25.0 grams of Al2O₃ react with excess HCl according to the following equation. Al2O₃(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H2O(l)

In an oxidation-reduction reaction, the substance oxidized always

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When 10.0 g of NH₃ reacts, the actual yield of N₂ is 8.50 g. What is the percent yield? 4NH₃(g) + 6NO(g) → 5N₂(g) + 6H₂O(l)

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O2 reacts completely is

Barium chloride and sodium sulfate react according to the following equation. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl Answer the question(s) that follow about this reaction. -How many moles of barium sulfate are produced from 0.100 mole of barium chloride?

How many grams of CO₂ are produced from 125 g of O₂ and excess CH₄ ? CH₄ + 2O₂ → CO₂ + 2H₂O

The following reaction is balanced. KClO₃ → KCl + O₂

When 60.0 g of CH₄ reacts with excess O₂, the actual yield of CO₂ is 112 g. What is the percent yield? CH₄ + 2O₂ → CO₂ + 2H₂O

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H₂

What is the molar mass of sodium phosphate, Na₃PO₄ ?

The following is a decomposition reaction. 2KClO₃ → 2KCl + 3O₂

Acetylene gas, C₂H₂, reacts with oxygen according to the following equation. If 1.00 mole of acetylene reacts completely with sufficient oxygen, how many moles of carbon dioxide are produced? 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

How many moles of iron are present in 3.15 × 10²⁴ atoms of iron?

The molar mass of C₃H₈O₂ is

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O₂ to the number of moles of Fe₂O₃ produced? 4Fe(s) + 3O₂ (g) → 2Fe₂O₃(s)

Find the mass of AlCl₃ that is produced when 25.0 grams of Al₂O₃ react with excess HCl according to the following equation. Al₂O₃(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂O(l)