Question 1

Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 50.0 mL of solution.

Accepted Answer

A) 0.0297 mol L-1 
B) 0.0337 mol L-1 
C) 0.0936 mol L-1 
D) 0.0107 mol L-1 
E) 0.0651 mol L-1 
A) 0.0297 mol L-1 
B) 0.0337 mol L-1 
C) 0.0936 mol L-1 
D) 0.0107 mol L-1 
E) 0.0651 mol L-1

Question 2

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation? 2S(s)+ 3O2(g)+ 4NaOH(aq)→ 2Na2SO4(aq)+ 2H2O(l)

Accepted Answer

A) S(s) 
B) O2(g) 
C) NaOH(aq) 
D) None of these substances is the limiting reactant. 
A) S(s) 
B) O2(g) 
C) NaOH(aq) 
D) None of these substances is the limiting reactant.

Question 3

Which one of the following compounds behaves as an acid when dissolved in water?

Accepted Answer

A) RaO 
B) C4H10 
C) HI 
D) RbOH 
A) RaO 
B) C4H10 
C) HI 
D) RbOH

Question 4

How many millilitres of a 9.0 mol L-1 H2SO4 solution are needed to make 0.35 L of a 3.5 mol L-1 solution?

Accepted Answer

A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL 
A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL

Question 5

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N2(g)→ 2Li3N(s)
How many moles of N2 are needed to react with 0.500 mol of lithium?

Accepted Answer

A) 3.00 
B) 0.500 
C) 0.167 
D) 1.50 
E) 0.0833 
A) 3.00 
B) 0.500 
C) 0.167 
D) 1.50 
E) 0.0833

Question 6

HBr , HI , H NO3, NaBr , and KNO3 are all classified as

Accepted Answer

A) acids. 
B) nonelectrolytes. 
C) strong electrolytes. 
D) weak electrolytes. 
A) acids. 
B) nonelectrolytes. 
C) strong electrolytes. 
D) weak electrolytes.

Question 7

What is the oxidation number of the chromium atom in K2CrO4 ?

Accepted Answer

A) -2 
B) +2 
C) +6 
D) +7 
A) -2 
B) +2 
C) +6 
D) +7

Question 8

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L-1 solution?

Accepted Answer

A) 58.40 g 
B) 175.3 g 
C) 14.60 g 
D) 43.83 g 
A) 58.40 g 
B) 175.3 g 
C) 14.60 g 
D) 43.83 g

Question 9

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is FALSE? N2(g)+ 3H2(g)→ 2NH3(g)

Accepted Answer

A) 3.5 g of hydrogen are left over. 
B) Hydrogen is the excess reactant. 
C) Nitrogen is the limiting reactant. 
D) The theoretical yield of ammonia is 15 g 
A) 3.5 g of hydrogen are left over. 
B) Hydrogen is the excess reactant. 
C) Nitrogen is the limiting reactant. 
D) The theoretical yield of ammonia is 15 g

Question 10

If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

Accepted Answer

A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g 
A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g

Question 11

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

Accepted Answer

Question 12

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3(s)→ 2Na(s)+ 3N2(g)
How many moles of N2 are produced by the decomposition of 2.88 mol of sodium azide?

Accepted Answer

A) 1.92 
B) 8.64 
C) 4.32 
D) 0.960 
E) 1.44 
A) 1.92 
B) 8.64 
C) 4.32 
D) 0.960 
E) 1.44

Question 13

What are the required coefficients to properly balance the following chemical reaction? 
MnCl2(s)+ H2O(l)+ Cl2(g)→ HCl(aq)+ MnO2(s)

Accepted Answer

A) 1, 2, 1, 4, 1 
B) 2, 2, 1, 4, 2 
C) 1, 1, 1, 2, 1 
D) 1, 1, 1, 4, 1 
E) 2, 1, 1, 4, 2 
A) 1, 2, 1, 4, 1 
B) 2, 2, 1, 4, 2 
C) 1, 1, 1, 2, 1 
D) 1, 1, 1, 4, 1 
E) 2, 1, 1, 4, 2

Question 14

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

Accepted Answer

A) 20.00% 
B) 25.00% 
C) 50.00% 
D) 12.50% 
A) 20.00% 
B) 25.00% 
C) 50.00% 
D) 12.50%

Question 15

A FeCl3 solution is 0.175 mol L-1. How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 450. mL of a solution that is 0.300 mol L-1 in Cl- ion?

Accepted Answer

A) 0.771 mL 
B) 257 mL 
C) 771 mL 
D) It is not possible to make a more concentrated solution from a less concentrated solution. 
A) 0.771 mL 
B) 257 mL 
C) 771 mL 
D) It is not possible to make a more concentrated solution from a less concentrated solution.

Question 16

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? ___ NO3-(aq)+ ___ Cu(s)→ ___ NO(g)+ ___ Cu2+(aq)?

Accepted Answer

A) 2, 3 
B) 2, 6 
C) 3, 4 
D) 3, 6 
A) 2, 3 
B) 2, 6 
C) 3, 4 
D) 3, 6

Question 17

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

Accepted Answer

A) 2.81 moles NO 
B) 25.3 moles NO 
C) 8.44 moles NO 
D) 5.63 moles NO 
E) 1.83 moles NO 
A) 2.81 moles NO 
B) 25.3 moles NO 
C) 8.44 moles NO 
D) 5.63 moles NO 
E) 1.83 moles NO

Question 18

What are the required coefficients to properly balance the following chemical reaction? 
SO2(g)+ O2(g)+ H2O(l)→ H2SO4(aq)

Accepted Answer

A) 1, 1, 1, 1 
B) 1, 2, 1, 2 
C) 1, 2, 2, 1 
D) 2, 1, 2, 2 
E) 2, 1, 1, 2 
A) 1, 1, 1, 1 
B) 1, 2, 1, 2 
C) 1, 2, 2, 1 
D) 2, 1, 2, 2 
E) 2, 1, 1, 2

Question 19

Based on the balanced chemical equation shown below, what volume of 0.250 mol L-1 K2S2O3(aq)is needed to completely react with 24.88 mL of 0.125 mol L-1 KI3(aq), according to the following chemical equation: 2S2O32-(aq)+ I3-(aq)→ S4O62-(aq)+ 3I-(aq).

Accepted Answer

A) 6.22 mL 
B) 12.4 mL 
C) 24.9 mL 
D) 99.5 mL 
A) 6.22 mL 
B) 12.4 mL 
C) 24.9 mL 
D) 99.5 mL

Question 20

When 11.0 g of calcium metal is reacted with water, 5.00 g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield for the reaction. Ca(s)+ 2H2O(l)→ Ca(OH)2(aq)+ H2(g)

Accepted Answer

A) 12.3% 
B) 24.6% 
C) 45.5% 
D) 84.0% 
A) 12.3% 
B) 24.6% 
C) 45.5% 
D) 84.0%

Exam 4: Chemical Reactions and Stoichiometry

Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 50.0 mL of solution.

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation? 2S(s)+ 3O2(g)+ 4NaOH(aq)→ 2Na2SO4(aq)+ 2H2O(l)

Which one of the following compounds behaves as an acid when dissolved in water?

How many millilitres of a 9.0 mol L-1 H2SO4 solution are needed to make 0.35 L of a 3.5 mol L-1 solution?

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N2(g)→ 2Li3N(s) How many moles of N2 are needed to react with 0.500 mol of lithium?

HBr , HI , H NO3, NaBr , and KNO3 are all classified as

What is the oxidation number of the chromium atom in K2CrO4 ?

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L-1 solution?

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is FALSE? N2(g)+ 3H2(g)→ 2NH3(g)

If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3(s)→ 2Na(s)+ 3N2(g) How many moles of N2 are produced by the decomposition of 2.88 mol of sodium azide?

What are the required coefficients to properly balance the following chemical reaction? MnCl2(s)+ H2O(l)+ Cl2(g)→ HCl(aq)+ MnO2(s)

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

A FeCl3 solution is 0.175 mol L-1. How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 450. mL of a solution that is 0.300 mol L-1 in Cl- ion?

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? ___ NO3-(aq)+ ___ Cu(s)→ ___ NO(g)+ ___ Cu2+(aq)?

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

What are the required coefficients to properly balance the following chemical reaction? SO2(g)+ O2(g)+ H2O(l)→ H2SO4(aq)

Based on the balanced chemical equation shown below, what volume of 0.250 mol L-1 K2S2O3(aq)is needed to completely react with 24.88 mL of 0.125 mol L-1 KI3(aq), according to the following chemical equation: 2S2O32-(aq)+ I3-(aq)→ S4O62-(aq)+ 3I-(aq).

When 11.0 g of calcium metal is reacted with water, 5.00 g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield for the reaction. Ca(s)+ 2H2O(l)→ Ca(OH)2(aq)+ H2(g)

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Determine the molarity of a solution formed by dissolving 468 mg of MgI₂ in enough water to yield 50.0 mL of solution.

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation? 2S(s)+ 3O₂(g)+ 4NaOH(aq)→ 2Na₂SO₄(aq)+ 2H₂O(l)

How many millilitres of a 9.0 mol L^-1 H₂SO₄ solution are needed to make 0.35 L of a 3.5 mol L^-1 solution?

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N₂(g)→ 2Li₃N(s) How many moles of N₂ are needed to react with 0.500 mol of lithium?

HBr, HI, HNO₃, NaBr, and KNO₃ are all classified as

What is the oxidation number of the chromium atom in K₂CrO₄?

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L^-1 solution?

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is FALSE? N₂(g)+ 3H₂(g)→ 2NH₃(g)

If the percent yield for the following reaction is 75.0%, and 45.0 g of NO₂ are consumed in the reaction, how many grams of nitric acid, HNO₃(aq), are produced? 3NO₂(g)+ H₂O(l)→ 2HNO₃(aq)+ NO(g)

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L^-1 NaOH solution?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃(s)→ 2Na(s)+ 3N₂(g) How many moles of N₂ are produced by the decomposition of 2.88 mol of sodium azide?

What are the required coefficients to properly balance the following chemical reaction? MnCl₂(s)+ H₂O(l)+ Cl₂(g)→ HCl(aq)+ MnO₂(s)

Identify the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

A FeCl₃ solution is 0.175 mol L^-1. How many mL of a 0.175 mol L^-1 FeCl₃solution are needed to make 450. mL of a solution that is 0.300 mol L^-1 in Cl^- ion?

What are the coefficients in front of NO₃^-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? _ NO₃^-(aq)+ _ Cu(s)→ _ NO(g)+ _ Cu²⁺(aq)?

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g)+ H₂O(l)→ 2HNO₃(aq)+ NO(g)

What are the required coefficients to properly balance the following chemical reaction? SO₂(g)+ O₂(g)+ H₂O(l)→ H₂SO₄(aq)

Based on the balanced chemical equation shown below, what volume of 0.250 mol L^-1 K₂S₂O₃(aq)is needed to completely react with 24.88 mL of 0.125 mol L^-1 KI₃(aq), according to the following chemical equation: 2S₂O₃^2-(aq)+ I₃^-(aq)→ S₄O₆^2-(aq)+ 3I^-(aq).

When 11.0 g of calcium metal is reacted with water, 5.00 g of calcium hydroxide is produced. Using the following balanced equation, calculate the percent yield for the reaction. Ca(s)+ 2H₂O(l)→ Ca(OH)₂(aq)+ H₂(g)