Chemistry: Supplemental Stoichiometry Problems Page 2
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1
2
3
4 2 KCl
4A. How many grams of potassium chloride are produced from…
2 K + Cl
2
…2.50 g of potassium and excess chlorine?
…1.00 g of chlorine and excess potassium?
4B.
Fe
5A. If 25.0 g of iron(III) phosphate react with excess sodium
2 FePO
+ 3 Na
SO
(SO
)
+ 2 Na
PO
4
2
4
2
4
3
3
4
sulfate, how many grams of iron(III) sulfate can be made?
5B. If 18.5 grams of iron(III) sulfate are actually
produced in Q5A, what is the percent yield?
5C. Now, a different trial of the reaction is done, starting with 15.0 grams of sodium sulfate and excess iron(III)
phosphate. If that trial achieves a 65.0% yield, how many grams of sodium phosphate were made?
2
O 2 NaOH
6A. What mass of sodium hydroxide is made from 1.20 x 10
g of sodium oxide?
Na
O + H
2
2
2
6B. How many grams of sodium oxide are required to produce 1.60 x 10
grams of sodium hydroxide?
7. A human needs about 120. grams of glucose per day. How many
O C
grams of carbon dioxide are used by plants to produce this
6 CO
+ 6 H
H
O
+ 6 O
2
2
6
12
6
2
amount of glucose?
ANSWERS:
4A. 4.77 g KCl
5A. 33.1 g Fe
(SO
)
5C. 7.50 g Na
PO
6B. 124 g Na
O
2
4
3
3
4
2
4B. 2.10 g KCl
5B. 55.9%
6A. 155 g NaOH
7. 176 g CO
2
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