Question 1

In reacting aluminum carbonate with hydrochloric acid according to the equation Al2(CO3)3 + 6 HCl $\rightarrow$ 2 AlCl3 + 3 H2O + 3 CO2,57.6 mg of carbon dioxide was formed.What mass of aluminum carbonate reacted to form this amount of carbon dioxide?

Accepted Answer

A) 10.8 mg 
B) 32.5 mg 
C) 102 mg 
D) 306 mg 
E) 919 mg

Question 2

Barium chloride was used to precipitate silver chloride from a solution of silver nitrate.What mass of barium chloride had to react if 0.635 g of silver chloride formed?

Accepted Answer

A) 0.437 g 
B) 0.461 g 
C) 0.874 g 
D) 0.923 g 
E) 1.85 g

Question 3

The decomposition of potassium chlorate is written as shown below.What energy change occurs when 12.3 g of KClO3 decompose? 2 KClO3(s)+ 89.6 kJ $\rightarrow$ 2 KCl(s)+ 3 O2(g)

Accepted Answer

A) Release of 8.99 kJ 
B) Absorption of 8.99 kJ 
C) Release of 4.49 kJ 
D) Absorption of 4.49 kJ 
E) Release of 0.00112 kJ

Question 4

A chemist combines hydrochloric acid with a sodium hydroxide solution,transferring 5.75 kJ of heat.Express this in calories.

Accepted Answer

A) 2.41* 10-2 cal 
B) 2.41* 101 cal 
C) 2.41 *104 cal 
D) 1.37 *10-3 cal 
E) 1.37 * 103 cal

Question 5

Calculate the mass of Na2O that can be produced by the reaction of 4.00 g of sodium and 2.00 g of oxygen in the reaction 4 Na + O2 $\rightarrow$2 Na2O.

Accepted Answer

A) 1.94 g 
B) 2.00 g 
C) 4.50 g 
D) 5.39 g 
E) 6.00 g

Question 6

How many moles of water are produced by burning 5.77 moles of C4H10?

Accepted Answer

A) 1.15 mol 
B) 5.77 mol 
C) 23.1 mol 
D) 28.9 mol 
E) 37.5 mol

Question 7

A typical diet provides about 2000 food Calories per day,or 2000 kilocalories.Calculate the equivalent number of joules.

Accepted Answer

A) 8 J 
B) 8 *103 J 
C) 8 * 106 J 
D) 0.5 J 
E) 5 * 105 J

Question 8

The metabolism of glucose can be represented by the equation C6H12O6(s)+ 6 O2(g)$\rightarrow$6 CO2(g)+ 6 H2O(g)$\Delta$H = -2.82 *103 kJ.How many grams of glucose must be metabolized to produce 282 kJ of energy?

Accepted Answer

A) 18.0 g 
B) 1.80 * 102 g 
C) 0.100 g 
D) 10.0 g 
E) 67.4 g

Question 9

The reaction C6H6 + HNO3 $\rightarrow$C6H5NO2 + H2O has a 73.5 percent yield under certain conditions.If 12.75 g of C6H6 is used,how much C6H5NO2 will be produced?

Accepted Answer

A) 20.1 g 
B) 27.4 g 
C) 8.09 g 
D) 11.0 g 
E) 14.8 g

Question 10

A typical candy bar contains 281 food Calories,which is 281 kcal.How many kilojoules are contained in one such candy bar?

Accepted Answer

A) 1.18 * 103 kJ 
B) 1.18 *104 kJ 
C) 67.2 kJ 
D) 672 kJ 
E) 6.72 * 104 kJ

Question 11

Consider the conversion diagram given below.  At which point(s)in the diagram is a molar mass needed?

Accepted Answer

A) A and B 
B) B and E 
C) A and D 
D) D and E 
E) C only

Question 12

Convert 357 J to kcal.

Accepted Answer

A) 1.49 kcal 
B) 1.49 * 106 kcal 
C) 8.53 *104 kcal 
D) 85.3 kcal 
E) 0.0853 kcal

Question 13

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which $\Delta$H is -185 kJ.Which of the following statements is correct?
(i)The reaction is exothermic.
(ii)Enthalpy of the system decreases.
(iii)Heat is a "product".

Accepted Answer

A) All are correct 
B) All are incorrect 
C) i only 
D) ii only 
E) iii only

Question 14

Ammonium sulfate can be made by the reaction H2SO4 + 2 NH3 $\rightarrow$(NH4)2SO4.What quantity of ammonium sulfate will result from the reaction of 5.00 kg of ammonia and 20.0 kg of sulfuric acid?

Accepted Answer

A) 13.5 kg 
B) 19.4 kg 
C) 25.0 kg 
D) 26.9 kg 
E) 38.8 kg

Question 15

How much energy is required to produce 1.00 kg of aluminum by the reaction 2 Al2O3(s)+ 3 C(s)+ 1.97 * 103 kJ $\rightarrow$4 Al(s)+ 3 CO2(g)?

Accepted Answer

A) 5.50 * 10-5 kJ 
B) 7.52 * 10-2 kJ 
C) 2.70 *103 kJ 
D) 7.30 * 104 kJ 
E) 1.83 * 104 kJ

Question 16

How many moles of bromine will react with 0.0500 mole of C2H2 in the reaction C2H4 + Br2 $\rightarrow$C2H4Br2?

Accepted Answer

A) 0.100 mol 
B) 0.186 mol 
C) 0.0250 mol 
D) 0.0500 mol 
E) 2.00 mol

Question 17

Consider the hypothetical reaction A + 2 B $\rightarrow$AB2.If 2 moles of A and 5 moles of B are placed in a container an allowed to react,how many moles of AB2 will be formed and how many moles of which reactant will remain unreacted?

Accepted Answer

A) 2 moles of AB2 will form and 3 moles of B will remain unreacted. 
B) 2 moles of AB2 will form and 1 mole of B will remain unreacted. 
C) 5 moles of AB2 will form and 3 moles of B will remain unreacted. 
D) 4 moles of AB2 will form and 1 mole of B will remain unreacted. 
E) 5/2 (2.5)moles of AB2 will form and nothing will remain unreacted.

Question 18

The thermochemical equation describing the heat change in the decomposition of limestone,CaCO3,is given by CaCO3(s)+ 176 kJ$\rightarrow$ CaO(s)+ CO2(g).What is the heat change that accompanies the decomposition of 25.0 g of limestone?

Accepted Answer

A) 7.12 kJ 
B) 25.0 kJ 
C) 44.0 kJ 
D) 176 kJ 
E) 1.42 *10-3 kJ

Question 19

When 1.00 g of C6H12O6(s)is formed during photosynthesis,15.67 kJ of the sun's energy is converted to chemical energy.What is the thermochemical equation for the photosynthesis of glucose?

Accepted Answer

A) 6 CO2(g)+ 6 H2O(g)$\rightarrow$C6H12O6(s)+ 6 O2(g)+ 15.67 kJ 
B) CO2(g)+ H2O(g)$\rightarrow$C6H12O6(s)+ O2(g)?0?H = 15.67 kJ 
C) 6 CO2(g)+ 6 H2O(g)+ 2.82 *103 kJ $\rightarrow$C6H12O6(s)+ 6 O2(g) 
D) C6H12O6(s)+ 6 O2(g)$\rightarrow$ 6 CO2(g)+ 6 H2O(g)+ 2.82*103 kJ 
E) 6 CO2(g)+ 6 H2O(g)$\rightarrow$C6H12O6(s)+ 6 O2(g)?0?H = -2.82 * 103 kJ

Question 20

In the reaction P4 + 5 O2 $\rightarrow$ 2 P2O5,in order the convert from moles of any substance to moles of another substance as shown by the block diagram.  What is the conversion factor needed?

Accepted Answer

A) molar mass of a reactant 
B) molar mass of a product 
C) mole ratio from the equation 
D) Avogadro's number

Exam 10: Quantity Relationships in Chemical Reactions

In reacting aluminum carbonate with hydrochloric acid according to the equation Al₂(CO₃) ₃ + 6 HCl $\rightarrow$ 2 AlCl₃ + 3 H₂O + 3 CO₂,57.6 mg of carbon dioxide was formed.What mass of aluminum carbonate reacted to form this amount of carbon dioxide?

Barium chloride was used to precipitate silver chloride from a solution of silver nitrate.What mass of barium chloride had to react if 0.635 g of silver chloride formed?

The decomposition of potassium chlorate is written as shown below.What energy change occurs when 12.3 g of KClO₃ decompose? 2 KClO₃(s) + 89.6 kJ $\rightarrow$ 2 KCl(s) + 3 O₂(g)

A chemist combines hydrochloric acid with a sodium hydroxide solution,transferring 5.75 kJ of heat.Express this in calories.

Calculate the mass of Na₂O that can be produced by the reaction of 4.00 g of sodium and 2.00 g of oxygen in the reaction 4 Na + O₂ $\rightarrow$ 2 Na₂O.

How many moles of water are produced by burning 5.77 moles of C₄H₁₀?

A typical diet provides about 2000 food Calories per day,or 2000 kilocalories.Calculate the equivalent number of joules.

The metabolism of glucose can be represented by the equation C₆H₁₂O₆(s) + 6 O₂(g) $\rightarrow$ 6 CO₂(g) + 6 H₂O(g) $\Delta$ H = -2.82 *10³ kJ.How many grams of glucose must be metabolized to produce 282 kJ of energy?

The reaction C₆H₆ + HNO₃ $\rightarrow$ C₆H₅NO₂ + H₂O has a 73.5 percent yield under certain conditions.If 12.75 g of C₆H₆ is used,how much C₆H₅NO₂ will be produced?

A typical candy bar contains 281 food Calories,which is 281 kcal.How many kilojoules are contained in one such candy bar?

Consider the conversion diagram given below. At which point(s) in the diagram is a molar mass needed?

Convert 357 J to kcal.

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which $\Delta$ H is -185 kJ.Which of the following statements is correct? (i) The reaction is exothermic. (ii) Enthalpy of the system decreases. (iii) Heat is a "product".

Ammonium sulfate can be made by the reaction H₂SO₄ + 2 NH₃ $\rightarrow$ (NH₄) ₂SO₄.What quantity of ammonium sulfate will result from the reaction of 5.00 kg of ammonia and 20.0 kg of sulfuric acid?

How much energy is required to produce 1.00 kg of aluminum by the reaction 2 Al₂O₃(s) + 3 C(s) + 1.97 * 10³ kJ $\rightarrow$ 4 Al(s) + 3 CO₂(g) ?

How many moles of bromine will react with 0.0500 mole of C₂H₂ in the reaction C₂H₄ + Br₂ $\rightarrow$ C₂H₄Br₂?

Consider the hypothetical reaction A + 2 B $\rightarrow$ AB₂.If 2 moles of A and 5 moles of B are placed in a container an allowed to react,how many moles of AB₂ will be formed and how many moles of which reactant will remain unreacted?

The thermochemical equation describing the heat change in the decomposition of limestone,CaCO₃,is given by CaCO₃(s) + 176 kJ $\rightarrow$ CaO(s) + CO₂(g) .What is the heat change that accompanies the decomposition of 25.0 g of limestone?

When 1.00 g of C₆H₁₂O₆(s) is formed during photosynthesis,15.67 kJ of the sun's energy is converted to chemical energy.What is the thermochemical equation for the photosynthesis of glucose?

Exam 10: Quantity Relationships in Chemical Reactions

In reacting aluminum carbonate with hydrochloric acid according to the equation Al2(CO3) 3 + 6 HCl →\rightarrow→ 2 AlCl3 + 3 H2O + 3 CO2,57.6 mg of carbon dioxide was formed.What mass of aluminum carbonate reacted to form this amount of carbon dioxide?

Barium chloride was used to precipitate silver chloride from a solution of silver nitrate.What mass of barium chloride had to react if 0.635 g of silver chloride formed?

The decomposition of potassium chlorate is written as shown below.What energy change occurs when 12.3 g of KClO3 decompose? 2 KClO3(s) + 89.6 kJ →\rightarrow→ 2 KCl(s) + 3 O2(g)

A chemist combines hydrochloric acid with a sodium hydroxide solution,transferring 5.75 kJ of heat.Express this in calories.

Calculate the mass of Na2O that can be produced by the reaction of 4.00 g of sodium and 2.00 g of oxygen in the reaction 4 Na + O2 →\rightarrow→ 2 Na2O.

How many moles of water are produced by burning 5.77 moles of C4H10?

A typical diet provides about 2000 food Calories per day,or 2000 kilocalories.Calculate the equivalent number of joules.

The metabolism of glucose can be represented by the equation C6H12O6(s) + 6 O2(g) →\rightarrow→ 6 CO2(g) + 6 H2O(g) Δ\DeltaΔ H = -2.82 *103 kJ.How many grams of glucose must be metabolized to produce 282 kJ of energy?

The reaction C6H6 + HNO3 →\rightarrow→ C6H5NO2 + H2O has a 73.5 percent yield under certain conditions.If 12.75 g of C6H6 is used,how much C6H5NO2 will be produced?

A typical candy bar contains 281 food Calories,which is 281 kcal.How many kilojoules are contained in one such candy bar?

Consider the conversion diagram given below. At which point(s) in the diagram is a molar mass needed?

Convert 357 J to kcal.

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which Δ\DeltaΔ H is -185 kJ.Which of the following statements is correct? (i) The reaction is exothermic. (ii) Enthalpy of the system decreases. (iii) Heat is a "product".

Ammonium sulfate can be made by the reaction H2SO4 + 2 NH3 →\rightarrow→ (NH4) 2SO4.What quantity of ammonium sulfate will result from the reaction of 5.00 kg of ammonia and 20.0 kg of sulfuric acid?

How much energy is required to produce 1.00 kg of aluminum by the reaction 2 Al2O3(s) + 3 C(s) + 1.97 * 103 kJ →\rightarrow→ 4 Al(s) + 3 CO2(g) ?

How many moles of bromine will react with 0.0500 mole of C2H2 in the reaction C2H4 + Br2 →\rightarrow→ C2H4Br2?

Consider the hypothetical reaction A + 2 B →\rightarrow→ AB2.If 2 moles of A and 5 moles of B are placed in a container an allowed to react,how many moles of AB2 will be formed and how many moles of which reactant will remain unreacted?

The thermochemical equation describing the heat change in the decomposition of limestone,CaCO3,is given by CaCO3(s) + 176 kJ →\rightarrow→ CaO(s) + CO2(g) .What is the heat change that accompanies the decomposition of 25.0 g of limestone?

When 1.00 g of C6H12O6(s) is formed during photosynthesis,15.67 kJ of the sun's energy is converted to chemical energy.What is the thermochemical equation for the photosynthesis of glucose?

In the reaction P4 + 5 O2 →\rightarrow→ 2 P2O5,in order the convert from moles of any substance to moles of another substance as shown by the block diagram. What is the conversion factor needed?

In reacting aluminum carbonate with hydrochloric acid according to the equation Al₂(CO₃) ₃ + 6 HCl $\rightarrow$ 2 AlCl₃ + 3 H₂O + 3 CO₂,57.6 mg of carbon dioxide was formed.What mass of aluminum carbonate reacted to form this amount of carbon dioxide?

The decomposition of potassium chlorate is written as shown below.What energy change occurs when 12.3 g of KClO₃ decompose? 2 KClO₃(s) + 89.6 kJ $\rightarrow$ 2 KCl(s) + 3 O₂(g)

Calculate the mass of Na₂O that can be produced by the reaction of 4.00 g of sodium and 2.00 g of oxygen in the reaction 4 Na + O₂ $\rightarrow$ 2 Na₂O.

How many moles of water are produced by burning 5.77 moles of C₄H₁₀?

The metabolism of glucose can be represented by the equation C₆H₁₂O₆(s) + 6 O₂(g) $\rightarrow$ 6 CO₂(g) + 6 H₂O(g) $\Delta$ H = -2.82 *10³ kJ.How many grams of glucose must be metabolized to produce 282 kJ of energy?

The reaction C₆H₆ + HNO₃ $\rightarrow$ C₆H₅NO₂ + H₂O has a 73.5 percent yield under certain conditions.If 12.75 g of C₆H₆ is used,how much C₆H₅NO₂ will be produced?

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which $\Delta$ H is -185 kJ.Which of the following statements is correct? (i) The reaction is exothermic. (ii) Enthalpy of the system decreases. (iii) Heat is a "product".

Ammonium sulfate can be made by the reaction H₂SO₄ + 2 NH₃ $\rightarrow$ (NH₄) ₂SO₄.What quantity of ammonium sulfate will result from the reaction of 5.00 kg of ammonia and 20.0 kg of sulfuric acid?

How much energy is required to produce 1.00 kg of aluminum by the reaction 2 Al₂O₃(s) + 3 C(s) + 1.97 * 10³ kJ $\rightarrow$ 4 Al(s) + 3 CO₂(g) ?

How many moles of bromine will react with 0.0500 mole of C₂H₂ in the reaction C₂H₄ + Br₂ $\rightarrow$ C₂H₄Br₂?

Consider the hypothetical reaction A + 2 B $\rightarrow$ AB₂.If 2 moles of A and 5 moles of B are placed in a container an allowed to react,how many moles of AB₂ will be formed and how many moles of which reactant will remain unreacted?

The thermochemical equation describing the heat change in the decomposition of limestone,CaCO₃,is given by CaCO₃(s) + 176 kJ $\rightarrow$ CaO(s) + CO₂(g) .What is the heat change that accompanies the decomposition of 25.0 g of limestone?

When 1.00 g of C₆H₁₂O₆(s) is formed during photosynthesis,15.67 kJ of the sun's energy is converted to chemical energy.What is the thermochemical equation for the photosynthesis of glucose?