Question 1

How many moles of carbon atoms are there in 0.500 mole of C2H6?

Accepted Answer

A)  0.500 moles 
B)  1.00 moles 
C)  3.00 moles 
D)  6.02 × $10^{23}$ moles 
E)  4.00 moles 
A)  0.500 moles 
B)  1.00 moles 
C)  3.00 moles 
D)  6.02 × $10^{23}$ moles 
E)  4.00 moles

Question 2

How many molecules of water, H₂O, are present in 75.0 g of H₂O?

Accepted Answer

A)  75.0 molecules 
B)  4.17 molecules 
C)  7.53 × 1024 molecules 
D)  2.51 × 1024 molecules 
E)  5.02 × 1024 molecules 
A)  75.0 molecules 
B)  4.17 molecules 
C)  7.53 × 1024 molecules 
D)  2.51 × 1024 molecules 
E)  5.02 × 1024 molecules

Question 3

How many moles of water, H₂O, are present in 75.0 g of H₂O?

Accepted Answer

A)  4.41 moles 
B)  4.17 moles 
C)  75.0 moles 
D)  7.50 moles 
E)  1.35 × 103 moles 
A)  4.41 moles 
B)  4.17 moles 
C)  75.0 moles 
D)  7.50 moles 
E)  1.35 × 103 moles

Question 4

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 5

The molar mass of calcium hydroxide, Ca(OH)₂, is

Accepted Answer

A)  58.1 g. 
B)  57.1 g. 
C)  74.1 g. 
D)  114.2 g. 
E)  38.0 g. 
A)  58.1 g. 
B)  57.1 g. 
C)  74.1 g. 
D)  114.2 g. 
E)  38.0 g.

Question 6

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 7

Pentane (CS1U1B15S1U1B0HS1U1B112S1U1B0) 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.
CS1U1B15S1U1B0HS1U1B112S1U1B0 + ? O₂ → ? CO₂ + ? H₂O
-What is the coefficient for water 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 8

Answer the question(s) that follow about the following reaction.
2H₂O₂ → 2H₂O + O₂
-How many grams of water will 100. grams of hydrogen peroxide ( H₂O₂ ) produce?

Accepted Answer

A)  3600 g 
B)  360. g 
C)  5.88 g 
D)  52.9 g 
E)  106 g 
A)  3600 g 
B)  360. g 
C)  5.88 g 
D)  52.9 g 
E)  106 g

Question 9

The molar mass of silver is 47 g.

Accepted Answer

A) True 
 B)False

Question 10

Pentane (CS1U1B15S1U1B0HS1U1B112S1U1B0) 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.
CS1U1B15S1U1B0HS1U1B112S1U1B0 + ? O₂ → ? CO₂ + ? H₂O
-What is the coefficient for oxygen 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 11

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-When 3.05 moles of CH4 are mixed with 5.03 moles of O₂ the limiting reactant is __________. 
CH4 + 2O₂ → CO₂ + 2H₂O

Accepted Answer

A)  CH4 
B)  O₂ 
C)  CO₂ 
D)  H₂O 
A)  CH4 
B)  O₂ 
C)  CO₂ 
D)  H₂O

Question 12

How many hydrogen atoms are present in 75.0 of g H₂O?

Accepted Answer

A)  75.0 atoms 
B)  4.17 atoms 
C)  7.53 × 1024 atoms 
D)  2.51 × 1024 atoms 
E)  5.02 × 1024 atoms 
A)  75.0 atoms 
B)  4.17 atoms 
C)  7.53 × 1024 atoms 
D)  2.51 × 1024 atoms 
E)  5.02 × 1024 atoms

Question 13

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.

Question 14

The molar mass of copper(II) chloride is 134.6 g.

Accepted Answer

A) True 
 B)False

Question 15

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

Accepted Answer

A)  1.0 mole. 
B)  2.0 moles. 
C)  3.0 moles. 
D)  4.0 moles. 
E)  6.0 moles. 
A)  1.0 mole. 
B)  2.0 moles. 
C)  3.0 moles. 
D)  4.0 moles. 
E)  6.0 moles.

Question 16

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-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 17

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? 
Pb(NO₃)₂(aq) + NaCl(aq) → PbCl₂ (s) + NaNO₃(aq)

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 18

How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?

Accepted Answer

A)  180. g 
B)  639 g 
C)  103 g 
D)  426 g 
E)  50.7 g 
A)  180. g 
B)  639 g 
C)  103 g 
D)  426 g 
E)  50.7 g

Question 19

What is oxidized and what is reduced in the following reaction? 
2Al(s) + 3Br₂ (g) → 2AlBr3(s)

Accepted Answer

A)  Al is oxidized and Br₂ is reduced. 
B)  AlBr3 is reduced and Br₂ is oxidized. 
C)  Al is reduced and Br₂ is oxidized. 
D)  AlBr3 is reduced and Al is oxidized. 
E)  AlBr3 is oxidized and Al is reduced. 
A)  Al is oxidized and Br₂ is reduced. 
B)  AlBr3 is reduced and Br₂ is oxidized. 
C)  Al is reduced and Br₂ is oxidized. 
D)  AlBr3 is reduced and Al is oxidized. 
E)  AlBr3 is oxidized and Al is reduced.

Question 20

4.00 moles of sodium have a mass of

Accepted Answer

A)  4.60 g. 
B)  11.0 g. 
C)  23.0 g. 
D)  44.0 g. 
E)  92.0 g. 
A)  4.60 g. 
B)  11.0 g. 
C)  23.0 g. 
D)  44.0 g. 
E)  92.0 g.

Exam 6: Chemical Reactions and Quantities

How many moles of carbon atoms are there in 0.500 mole of C2H6?

How many molecules of water, H₂O, are present in 75.0 g of H₂O?

How many moles of water, H₂O, are present in 75.0 g of H₂O?

The molar mass of C₃H₈O₂ is

The molar mass of calcium hydroxide, Ca(OH)₂, is

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

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 water in the balanced equation?

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many grams of water will 100. grams of hydrogen peroxide ( H₂O₂ ) produce?

The molar mass of silver is 47 g.

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 oxygen in the balanced equation?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH3(g) -When 3.05 moles of CH4 are mixed with 5.03 moles of O₂ the limiting reactant is __________. CH4 + 2O₂ → CO₂ + 2H₂O

How many hydrogen atoms are present in 75.0 of g H₂O?

In an oxidation-reduction reaction, the substance oxidized always

The molar mass of copper(II) chloride is 134.6 g.

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH3(g) -How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO₃)₂(aq) + NaCl(aq) → PbCl₂ (s) + NaNO₃(aq)

How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?

What is oxidized and what is reduced in the following reaction? 2Al(s) + 3Br₂ (g) → 2AlBr3(s)

4.00 moles of sodium have a mass of

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Filters

How many moles of carbon atoms are there in 0.500 mole of C₂H₆?

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 water in the balanced equation?

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 oxygen in the balanced equation?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH₃(g) -When 3.05 moles of CH₄ are mixed with 5.03 moles of O₂ the limiting reactant is __________. CH₄ + 2O₂ → CO₂ + 2H₂O

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH₃(g) -How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

How many grams of glucose (C₆H₁₂O₆) are in 3.55 moles of glucose?

What is oxidized and what is reduced in the following reaction? 2Al(s) + 3Br₂ (g) → 2AlBr₃(s)