STOICHIOMETRY EXAM REVIEW
1.) Given the following equation:
H
3
PO
4
+ 3 KOH ------> K
3
PO
4
+ 3 H
2
O
If 49.0 g of H
3
PO
4
is reacted with excess KOH, determine the percent yield of K
3
PO
4
if you isolate 49.0 g of K
3
PO
4
.
2.) Given the following equation:
H
2
SO
4
+ Ba(OH)
2
------> BaSO
4
+ H
2
O
If 98.0 g of H
2
SO
4
is reacted with excess Ba(OH)
2
, determine the percent yield of BaSO
4 if you isolate 213.7 g of BaSO
4
.
3.) Use the following equation to answer the question below:
Al(OH)
3
(s) + 3 HCl (aq) -------> AlCl
3
(aq) + 3 H
2
O (l)
Starting with 90.0 grams of Hydrochloric acid (HCl) and an excess Aluminum hydroxide
(Al(OH)
3
), how many moles of water (H
2
O) will be produced?
4.) Given the following equation: 8 H
2
+ S
8
---> 8 H
2
S, write the following molar ratios: a) H
2
: H
2
S __________________________ b) H
2
: S
8 c) H
2
S : S
8
__________________________
__________________________
5.) Given the following equation: 2 KClO
3
→ 2 KCl + 3 O
2
, how many moles of oxygen
(O
2
) are produced by the decomposition of 6.0 moles of potassium chlorate (KClO
3
)?
6.) Given the following equation: _____ Zn + _____ HCl → _____ ZnCl
2
+ _____H
2, how many moles of hydrogen (H
2
) are produced from the reaction of 3.0 moles of zinc (Zn)?
Balance the equation first!

7.) Given the following equation: 4 Al
2
O
3
+ 9 Fe

3 Fe
3
O
4
+ 8 Al, which reactant is limiting given 25.4 g of Al
2
O
3
and 10.2 g of Fe.
8.) Use the following equation for problem # 8
4 Al + 3 O
2
----> 2 Al
2
O
3
If you were given 74.00 grams of Al, how many grams of Al
2
O
3
would be produced?
9.) Given the following equation: C
3
H
8
+ 3O
2
→ 3CO
2
+ 4H
2
How many moles of oxygen are necessary to react completely with 4.0 moles of propane
(C
3
H
8
)?
10.) NaOH (s) + CO
2
(g)

Na
2
CO
3
(s) + H
2
O (l) a.) Which reagent is the limiting reactant when 1.85 mol NaOH and 1.00 mol CO
2
are allowed to react? b.) How many moles of Na
2
CO
3
can be produced?