Section 12.2
Stoichiometric Calculations
Practice Test
1.
Based on the following equation, how many moles of hydrochloric acid are needed to react with 0.64 moles of potassium permanganate?
2KMnO
4
+ 8 HCl → 3 Cl
2
+ 2 MnO
2
+ 4 H
2
O + 2KCl
a.
0.21 mol HCl
b.
0.64 mol HCl
c.
2.7 mol HCl
d.
5.1 mol HCl
Hint
2.
If sufficient hydrochloric acid is used to react completely with 48.6 g of magnesium, how much hydrogen will be produced?
2HCl + Mg → MgCl
2
+ H
2
a.
3 g
b.
2 mol
c.
1 mol
d.
6 g
Hint
3.
What mass of SrF
2
can be prepared from the reaction of 10.0 g Sr(OH)
2
with excess HF?
Sr(OH)
2
+ 2HF → SrF
2
+ 2H
2
O
a.
9.67 g
b.
9.82 g
c.
10.0 g
d.
10.3 g
Hint
4.
How many moles of sulfur are present in 5 moles of H
2
SO
4
?
a.
1 mol
b.
2 mol
c.
5 mol
d.
10 mol
Hint
5.
Balance the following equation with the smallest whole—number coefficients. How many grams of O
2
will be produced if 23.2 g of XeF
2
reacts with excess water?
XeF
2
+ H
2
O → Xe + HF + O
2
a.
2.19 g
b.
1.10 g
c.
3.31 g
d.
4.42 g
Hint
