Chemistry: Matter and Change

Chapter 11: Stoichiometry

Standardized Test Practice

1
What is the first thing you must do to solve a stoichiometric problem?
A)Find the limiting reactant.
B)Find the excess reactant.
C)Write a balanced chemical equation.
D)Find the empirical formula.
2
What is the ratio between the coefficients of any two substances in a balanced equation?
A)molar mass balanced equation
B)mole ratio
C)quadratic equation
D)chemical formula
3
How many moles of CO2 would be produced from 56 moles of O2 according to the following balanced equation?

2C2H6 + 7O2 → 4CO2 + 6H2O
A)16 mol
B)32 mol
C)224 mol
D)48 mol
4
How many grams of O2 are required to burn 18 g C5H12?

C5H12 + 8O2 → 5CO2 + 6H2O
A)16 g
B)32 g
C)64 g
D)80 g
5
If sufficient hydrochloric acid is used to react completely with 48.6 g of magnesium, how much hydrogen will be produced?

2HCl + Mg → MgCl2 + H2
A)3 g
B)2 mol
C)1 mol
D)6 g
6
How many moles of sulfur are present in 5 moles of H2SO4?
A)1 mol
B)2 mol
C)5 mol
D)10 mol
7
In the balanced chemical reaction shown above, what is the molar ratio of O2 to CO2?

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
A)5 to 4
B)4 to 3
C)3 to 1
D)5 to 3
8
When sodium metal is dropped into water, all the metal reacts in the equation shown above. What mass of hydrogen is liberated from a 92.0 gram piece of sodium?

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
A)8.06 g hydrogen
B)2.02 g hydrogen
C)4.03 g hydrogen
D)1.01 g hydrogen
9
What mass of SrF2 can be prepared from the reaction of 8.05 g of Sr(OH)2 with 3.88 g of HF?

Sr(OH)2 + 2HF → SrF2 + 2H2O
A)11.7 g
B)12.2 g
C)10.5 g
D)8.32 g
10
In the chemical reaction below, 3.27 grams of Zn are reacted with 3.30 grams of HCl. Which component will limit the reaction?

Zn + 2HCl → ZnCl2 + H2
A)Zn
B)HCl
C)ZnCl2
D)H2
11
What is the maximum amount of Ca3(PO4)2 that can be prepared from 9.8 grams of Ca(OH)2 and 9.8 grams of H3PO4?

3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
A)6.8 g
B)8.6 g
C)10.3 g
D)13 g
12
What is the percent yield of CO2 if a reaction using 10.0 g CO with excess O2 produces 12.8 g CO2?

2CO + O2 → 2CO2
A)76.40%
B)78.10%
C)81.50%
D)84.40%
13
What is the percent yield for the reaction between 9.8 grams of Ca(OH)2 and 9.8 grams of H3PO4 when 2.5 grams of Ca3(PO4)2 are actually obtained?

3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
A)0.19%
B)0.09%
C)0.27%
D)0.36%
14
Which of these is not a reason for percent yield to be less than theoretical yield?
A)Reactants and products might adhere to containers.
B)Competing reactions might form other products.
C)Some product may transform completely into energy.
D)Some product may be lost in the purification process.
15
The chemical reaction shown above runs with excess potassium chromate, and the final yield, 50.0 grams of Ag2CrO4, is reported as a 90% yield. What was the beginning mass of AgNO3?

2AgNO3(aq) + K2CrO4(aq)→ Ag2CrO4(s) + 2KNO3(aq)
A)0.335 grams
B)0.167 grams
C)55.6 grams
D)56.9 grams
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