Honors Chemistry Extra Stoichiometry Problems

[Pages:2]Honors Chemistry Extra Stoichiometry Problems

1. Silver nitrate reacts with barium chloride to form silver chloride and barium nitrate.

a. Write and balance the chemical equation.

2 AgNO3 + BaCl2 ! 2 AgCl + Ba(NO3)2

b. If 39.02 grams of barium chloride are reacted in an excess of silver nitrate, how many representative particles (and what type) of silver chloride are produced?

39.02 ! 1 ! 2 6.02 10!" . . = 2.256 10!" . .

1

208.233 ! 1 !

1

c. If 410.8 grams of barium nitrate are produced how many grams of silver nitrate were reacted?

410.8 (!)! 1

1 (!)! 261.335 (!)!

2 ! 1 (!)!

169.872 ! 1 !

=

534.1 !

2. Nitrogen gas is reacted with hydrogen gas to form nitrogen trihydride.

a. Write and balance the chemical equation.

N2(g) + 3 H2(g) ! 2 NH3(g)

b. How many liters of nitrogen trihydride are produced at STP if 80.28 grams of hydrogen gas are reacted in an excess of nitrogen?

80.28 ! 1

1 ! 2.016 !

2 ! 3 !

22.4 ! 1 !

=

594.7 !

c. How many grams of hydrogen are needed to fully react 621.9 grams of nitrogen gas?

621.9 ! 1

1 ! 28.014 !

3 ! 1 !

2.016 ! 1 !

=

134.3 !

d. How many liters of nitrogen gas are needed to completely react 90.38 L of hydrogen gas at STP?

90.28 ! 1

1 ! 22.4 !

1 ! 3 !

22.4 ! 1 !

=

30.09 !

OR

90.28 ! 1

1 ! 3 !

=

30.09 !

3. For the following problem, use the following chemical equation:

C8H18(l) + O2(g) ! CO2(g) + H2O(g)

a. Balance the chemical equation.

2 C8H18(l) + 25 O2(g) ! 16 CO2(g) + 18 H2O(g)

b. How many moles of oxygen are needed to fully react 837.4 grams of C8H18?

837.4 !!" 1

1 !!" 114.232 !!"

25 ! 2 !!"

=

91.63 !

c. How many liters of carbon dioxide gas are formed at STP when 3.829 x 1025 representative particles of C8H18 are reacted in an excess of oxygen gas?

3.829 10!" !!" 1

1 !!" 6.02 10!" !!"

16 ! 2 !!"

22.4 ! 1 !

=

1.140 10! !

d. How many grams of water are produced when 382.9 liters of oxygen gas at STP are fully reacted?

382.9 ! 1

1 ! 22.4 !

18 ! 25 !

18.015 ! 1 !

=

221.7 !

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