Question 1

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 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

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 4

In a general chemistry laboratory experiment,a student produces 2.73 g of a compound.She calculates the theoretical yield as 3.40 g.What is the percent yield?

Accepted Answer

A) 9.28% 
B) 80.3% 
C) 0.803% 
D) 125% 
E) 1.25%

Question 5

In the reaction 2 AgI + HgI2 → Ag2HgI4,2.00 g of AgI and 3.50 g of HgI2 were used.What is the limiting reactant?

Accepted Answer

A) AgI 
B) HgI2 
C) Ag2HgI4 
D) There is no limiting reactant.

Question 6

In reacting aluminum carbonate with hydrochloric acid according to the equation 
Al2(CO3)3 + 6 HCl → 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 7

If the reaction N2 + 3 H2 → 2 NH3 is carried out using 1.40 g of N2 and 0.400 g of H2,what mass of excess reactant will remain?

Accepted Answer

A) 0.200 g N2 
B) 1.00 g N2 
C) 0.100 g H2 
D) 0.300 g H2 
E) Both reactants will be completely consumed

Question 8

Consider the following thermochemical equation: CaO(s)+ H2O(  )→ Ca(OH)2(s)ΔH = -66.5 kJ Which of the following statements is/are correct?
i.The reaction is exothermic
ii.The reaction releases 66.5 kJ per gram of Ca(OH)2(s)formed
iii.Alternatively,the ΔH term could be added to the product side of the equation

Accepted Answer

A) i only 
B) ii only 
C) i and ii 
D) i and iii 
E) i, ii, and iii

Question 9

The thermochemical equation describing the heat change in the decomposition of limestone,CaCO3,is given by CaCO3(s)+ 176 kJ → 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 10

Consider the hypothetical reaction A + 2 B → 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 11

In the reaction P4 + 5 O2 → 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

Question 12

A chemical reaction resulted in 1.376 g of product,which represented a 78.5 percent yield for the reaction.What is the theoretical yield?

Accepted Answer

A) 0.785 g 
B) 1.08 g 
C) 10.8 g 
D) 1.75 g 
E) 2.16 g

Question 13

In the combustion of natural gas according to the equation CH4 + 2 O2 → CO2 + 2 H2O,how many grams of water are formed during the combustion of 0.264 mole of CH4?

Accepted Answer

A) 0.528 g 
B) 2.00 g 
C) 2.38 g 
D) 4.75 g 
E) 9.50 g

Question 14

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which ΔH 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 15

The reaction 2 Sb + 3 Cl2 → 2 SbCl3 has an 88.3% yield.If 4.07 g of SbCl3 is desired,what mass of chlorine should be used?

Accepted Answer

A) 2.15 g 
B) 0.957 g 
C) 1.68 g 
D) 1.90 g 
E) 3.00 g

Question 16

Ammonium sulfate can be made by the reaction H2SO4 + 2 NH3 → (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 17

What is the theoretical yield of phosphorus triiodide when 4.50 g of phosphorus is combined with 45.0 g of iodine? The compound is made by the direct combination of the elements.

Accepted Answer

A) 48.7 g 
B) 49.5 g 
C) 59.8 g 
D) 30.0 g 
E) 39.9 g

Question 18

In the reaction CaCN2 + 3 H2O → CaCO3 + 2 NH3,how many kilograms of NH3 will be produced when 25.0 kg of CaCN2 react with excess water?

Accepted Answer

A) 10.6 kg 
B) 12.9 kg 
C) 2.66 kg 
D) 5.31 kg 
E) 7.56 kg

Question 19

Silver nitrate and magnesium chloride solutions are mixed.What is the Per expression that allows one to convert moles of silver nitrate to moles of magnesium chloride?

Accepted Answer

A)   
B)   
C)   
D)

Question 20

Which of the following best describes a limiting reactant?

Accepted Answer

A) The reactant that limits the rate (or speed) of a chemical reaction. 
B) The reactant that limits the position of equilibrium in a reversible chemical change. 
C) The reactant that remains at the end of the reaction. 
D) The reactant that can produce the greatest amount of product. 
E) The reactant that is completely used up by a reaction.

Exam 10: Quantity Relationships in Chemical Reactions

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

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?

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

In a general chemistry laboratory experiment,a student produces 2.73 g of a compound.She calculates the theoretical yield as 3.40 g.What is the percent yield?

In the reaction 2 AgI + HgI₂ → Ag₂HgI₄,2.00 g of AgI and 3.50 g of HgI₂ were used.What is the limiting reactant?

In reacting aluminum carbonate with hydrochloric acid according to the equation Al₂(CO₃) ₃ + 6 HCl → 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?

If the reaction N₂ + 3 H₂ → 2 NH₃ is carried out using 1.40 g of N₂ and 0.400 g of H₂,what mass of excess reactant will remain?

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

Consider the hypothetical reaction A + 2 B → 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?

In the reaction P₄ + 5 O₂ → 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?

A chemical reaction resulted in 1.376 g of product,which represented a 78.5 percent yield for the reaction.What is the theoretical yield?

In the combustion of natural gas according to the equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many grams of water are formed during the combustion of 0.264 mole of CH₄?

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which ΔH 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".

The reaction 2 Sb + 3 Cl₂ → 2 SbCl₃ has an 88.3% yield.If 4.07 g of SbCl₃ is desired,what mass of chlorine should be used?

Ammonium sulfate can be made by the reaction H₂SO₄ + 2 NH₃ → (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?

What is the theoretical yield of phosphorus triiodide when 4.50 g of phosphorus is combined with 45.0 g of iodine? The compound is made by the direct combination of the elements.

In the reaction CaCN₂ + 3 H₂O → CaCO₃ + 2 NH₃,how many kilograms of NH₃ will be produced when 25.0 kg of CaCN₂ react with excess water?

Silver nitrate and magnesium chloride solutions are mixed.What is the Per expression that allows one to convert moles of silver nitrate to moles of magnesium chloride?

Which of the following best describes a limiting reactant?

Exam 10: Quantity Relationships in Chemical Reactions

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

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?

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

In a general chemistry laboratory experiment,a student produces 2.73 g of a compound.She calculates the theoretical yield as 3.40 g.What is the percent yield?

In the reaction 2 AgI + HgI2 → Ag2HgI4,2.00 g of AgI and 3.50 g of HgI2 were used.What is the limiting reactant?

In reacting aluminum carbonate with hydrochloric acid according to the equation Al2(CO3) 3 + 6 HCl → 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?

If the reaction N2 + 3 H2 → 2 NH3 is carried out using 1.40 g of N2 and 0.400 g of H2,what mass of excess reactant will remain?

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

Consider the hypothetical reaction A + 2 B → 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?

In the reaction P4 + 5 O2 → 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?

A chemical reaction resulted in 1.376 g of product,which represented a 78.5 percent yield for the reaction.What is the theoretical yield?

In the combustion of natural gas according to the equation CH4 + 2 O2 → CO2 + 2 H2O,how many grams of water are formed during the combustion of 0.264 mole of CH4?

Formation of two moles of hydrogen chloride gas from the gases hydrogen and chlorine is a reaction for which ΔH 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".

The reaction 2 Sb + 3 Cl2 → 2 SbCl3 has an 88.3% yield.If 4.07 g of SbCl3 is desired,what mass of chlorine should be used?

Ammonium sulfate can be made by the reaction H2SO4 + 2 NH3 → (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?

What is the theoretical yield of phosphorus triiodide when 4.50 g of phosphorus is combined with 45.0 g of iodine? The compound is made by the direct combination of the elements.

In the reaction CaCN2 + 3 H2O → CaCO3 + 2 NH3,how many kilograms of NH3 will be produced when 25.0 kg of CaCN2 react with excess water?

Silver nitrate and magnesium chloride solutions are mixed.What is the Per expression that allows one to convert moles of silver nitrate to moles of magnesium chloride?

Which of the following best describes a limiting reactant?

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

In the reaction 2 AgI + HgI₂ → Ag₂HgI₄,2.00 g of AgI and 3.50 g of HgI₂ were used.What is the limiting reactant?

In reacting aluminum carbonate with hydrochloric acid according to the equation Al₂(CO₃) ₃ + 6 HCl → 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?

If the reaction N₂ + 3 H₂ → 2 NH₃ is carried out using 1.40 g of N₂ and 0.400 g of H₂,what mass of excess reactant will remain?

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

Consider the hypothetical reaction A + 2 B → 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?

In the reaction P₄ + 5 O₂ → 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 the combustion of natural gas according to the equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many grams of water are formed during the combustion of 0.264 mole of CH₄?

The reaction 2 Sb + 3 Cl₂ → 2 SbCl₃ has an 88.3% yield.If 4.07 g of SbCl₃ is desired,what mass of chlorine should be used?

Ammonium sulfate can be made by the reaction H₂SO₄ + 2 NH₃ → (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?

In the reaction CaCN₂ + 3 H₂O → CaCO₃ + 2 NH₃,how many kilograms of NH₃ will be produced when 25.0 kg of CaCN₂ react with excess water?