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Worksheet Stoichiometry Practice Problems with Answer Key, Exercises of Chemistry

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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!๐‘”!๐ต๐‘Ž๐ถ๐‘™!
1!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐ต๐‘Ž๐ถ๐‘™!
208.233!๐‘”!๐ต๐‘Ž๐ถ๐‘™!
!๐‘ฅ!
2!๐‘š๐‘œ๐‘™๐‘’๐‘ !๐ด๐‘”๐ถ๐‘™
1!๐‘š๐‘œ๐‘™๐‘’!๐ต๐‘Ž๐ถ๐‘™!
!๐‘ฅ!
6.02!๐‘ฅ!10!"!๐‘“.๐‘ข.๐ด๐‘”๐ถ๐‘™
1!๐‘š๐‘œ๐‘™๐‘’!๐ด๐‘”๐ถ๐‘™ =2.256!๐‘ฅ!10!"!๐‘“.๐‘ข.๐ด๐‘”๐ถ๐‘™
c. If 410.8 grams of barium nitrate are produced how many grams of silver nitrate were
reacted?
410.8!๐‘”!๐ต๐‘Ž(๐‘๐‘‚!)!
1!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐ต๐‘Ž(๐‘๐‘‚!)!
261.335!๐‘”!๐ต๐‘Ž(๐‘๐‘‚!)!
!๐‘ฅ!
2!๐‘š๐‘œ๐‘™๐‘’๐‘ !๐ด๐‘”๐‘๐‘‚!
1!๐‘š๐‘œ๐‘™๐‘’!๐ต๐‘Ž(๐‘๐‘‚!)!
!๐‘ฅ!
169.872!๐‘”!๐ด๐‘”๐‘๐‘‚!
1!๐‘š๐‘œ๐‘™๐‘’!๐ด๐‘”๐‘๐‘‚!
=534.1!๐‘”!๐ด๐‘”๐‘๐‘‚!
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!๐‘”!๐ป!
1!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐ป!
2.016!๐‘”!๐ป!
!๐‘ฅ!
2!๐‘š๐‘œ๐‘™๐‘’๐‘ !๐‘๐ป!
3!๐‘š๐‘œ๐‘™๐‘’๐‘ !๐ป!
!๐‘ฅ!
22.4!๐ฟ!๐‘๐ป!
1!๐‘š๐‘œ๐‘™๐‘’!๐‘๐ป!
=594.7!๐ฟ!๐‘๐ป!
c. How many grams of hydrogen are needed to fully react 621.9 grams of nitrogen gas?
621.9!๐‘”!๐‘!
1!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐‘!
28.014!๐‘”!๐‘!
!๐‘ฅ!
3!๐‘š๐‘œ๐‘™๐‘’๐‘ !๐ป!
1!๐‘š๐‘œ๐‘™๐‘’!๐‘!
!๐‘ฅ!
2.016!๐‘”!๐ป!
1!๐‘š๐‘œ๐‘™๐‘’!๐ป!
=134.3!๐‘”!๐ป!
d. How many liters of nitrogen gas are needed to completely react 90.38 L of hydrogen gas
at STP?
90.28!๐ฟ!๐ป!
1!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐ป!
22.4!๐ฟ!๐ป!
!๐‘ฅ!
1!๐‘š๐‘œ๐‘™๐‘’!๐‘!
3!๐‘š๐‘œ๐‘™๐‘’!๐ป!
!๐‘ฅ!
22.4!๐ฟ!๐‘!
1!๐‘š๐‘œ๐‘™๐‘’!๐‘!
=30.09!๐ฟ!๐‘!!
OR
90.28!๐ฟ!๐ป!
1!๐‘ฅ!
1!๐ฟ!๐‘!
3!๐ฟ!๐ป!
=30.09!๐ฟ!๐‘!
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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 AgNO 3 + BaCl 2! 2 AgCl + Ba(NO 3 ) 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?
  2. 02 ๐‘” ๐ต๐‘Ž๐ถ๐‘™! 1

6. 02 ๐‘ฅ 10 !"^ ๐‘“. ๐‘ข. ๐ด๐‘”๐ถ๐‘™

= 2. 256 ๐‘ฅ 10 !"^ ๐‘“. ๐‘ข. ๐ด๐‘”๐ถ๐‘™

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

  1. 8 ๐‘” ๐ต๐‘Ž(๐‘๐‘‚!)! 1
  1. 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 ๐‘” ๐ป! 1

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

  1. 9 ๐‘” ๐‘! 1

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

  1. 28 ๐ฟ ๐ป! 1

OR

  1. For the following problem, use the following chemical equation: C 8 H 18 (l) + O 2 (g)! CO 2 (g) + H 2 O(g) a. Balance the chemical equation. 2 C 8 H18(l) + 25 O2(g)! 16 CO2(g) + 18 H 2 O(g) b. How many moles of oxygen are needed to fully react 837.4 grams of C 8 H 18?
  2. 4 ๐‘” ๐ถ!๐ป!" 1

c. How many liters of carbon dioxide gas are formed at STP when 3.829 x 10^25 representative particles of C 8 H 18 are reacted in an excess of oxygen gas?

  1. 829 ๐‘ฅ 10 !"^ ๐‘š๐‘œ๐‘™๐‘’๐‘๐‘ข๐‘™๐‘’๐‘  ๐ถ!๐ป!" 1 ๐‘ฅ 1 ๐‘š๐‘œ๐‘™๐‘’ ๐ถ!๐ป!"
  2. 02 ๐‘ฅ 10 !"^ ๐‘š๐‘œ๐‘™๐‘’๐‘๐‘ข๐‘™๐‘’๐‘  ๐ถ!๐ป!" ๐‘ฅ 16 ๐‘š๐‘œ๐‘™๐‘’๐‘  ๐ถ๐‘‚! 2 ๐‘š๐‘œ๐‘™๐‘’๐‘  ๐ถ!๐ป!" ๐‘ฅ
  3. 4 ๐ฟ ๐ถ๐‘‚! 1 ๐‘š๐‘œ๐‘™๐‘’ ๐ถ๐‘‚! = 1. 140 ๐‘ฅ 10!^ ๐ฟ ๐ถ๐‘‚! d. How many grams of water are produced when 382.9 liters of oxygen gas at STP are fully reacted?
  4. 9 ๐ฟ ๐‘‚! 1