Chemistry: Matter and Change

Section 2: Stoichiometric Calculations

Self Check Quizzes

1
Based on the following equation, how many moles of hydrochloric acid are needed to react with 0.64 moles of potassium permanganate?

2KMnO4 + 8 HCl → 3 Cl2 + 2 MnO2 + 4 H2O + 2KCl
A)0.21 mol HCl
B)0.64 mol HCl
C)2.7 mol HCl
D)5.1 mol HCl
2
What mass of SrF2 can be prepared from the reaction of 10.0 g Sr(OH)2 with excess HF?

Sr(OH)2 + 2HF → SrF2 + 2H2O
A)9.67 g
B)9.82 g
C)10.0 g
D)10.3 g
3
Balance the following equation with the smallest whole—number coefficients. How many grams of O2 will be produced if 23.2 g of XeF2 reacts with excess water?

XeF2 + H2O → Xe + HF + O2
A)2.19 g
B)1.10 g
C)3.31 g
D)4.42 g
4
In the balanced chemical reaction shown above, what is the molar ratio of Fe to Al?

Fe2O3(s) + 2Al(s) → 2Fe(s) +Al2O3(s)
A)2 to 1
B)1 to 1
C)3 to 1
D)1 to 2
5
Natural gas is mostly methane, CH4. When 128 grams of methane is burned in the chemical reaction shown above, how many grams of water vapor are produced?

CH4(g) + 2O2(g) →CO2(g) + 2H2O(g)
A)8.00 grams
B)144 grams
C)18.0 grams
D)288 grams
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