Stoichiometry Practice Problems
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Stoichiometry Practice Problems
1a) How many moles of chlorine gas would react with 5 moles of sodium according to the
following chemical equation? (Balance equation first)
NaCl
Na + Cl
2
1b) Using the equation (after it is balanced) above, determine the amount of product that can be
produced from 24.7 g of sodium.
1c) How many molecules of product would be produced from 24.7 g of sodium?
16 CO
2a) Using the reaction 2 C
H
+ 25 CO
+ 18 H
O, if 27.3 g of C
H
are
8
18
2
2
2
8
18
combusted, what mass of water will be produced?
2b) How many molecules of CO
will be produced?
2
3. Chlorine is used by textile manufacturers to bleach cloth. Excess chlorine is destroyed by its
reaction with sodium thiosulfate, Na
S
O
.
2
2
3
2 NaHSO
Na
S
O
+ 4 Cl
+ 5 H
O
+ 8 HCl
2
2
3 (aq)
2 (g)
2
(aq)
4 (aq)
(aq)
a) How many moles of Na
S
O
are needed to react with 0.12 moles of Cl
?
2
2
3
2
b) How many moles of HCl can form from 0.12 moles of Cl
?
2
c) How many moles of H
O are required for the reaction of 0.12 moles of Cl
?
2
2
d) How many moles of H
O react if 0.24 moles of HCl is formed?
2
4. The incandescent white of a fireworks display is caused by the reaction of phosphorous with
O
to give P
O
.
2
4
10
a) Write the balanced chemical equation for the reaction.
b) How many grams of O
are needed to combine with 6.85 g of P?
2
c) How many grams of P
O
can be made from 8.00 g of O
?
4
10
2
d) How many grams of P are needed to make 7.46 g of P
O
?
4
10
5. In dilute nitric acid, HNO
, copper metal dissolves according to the following equation:
3
3 Cu(NO
3 Cu
+ 8 HNO
)
+ 2 NO
+ 4 H
O
(s)
3 (aq)
3
2 (aq)
(g)
2
(aq)
How many grams of HNO
are needed to dissolve 11.45 g of Cu?
3
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This document last updated: 7/27/2011
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