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Worksheet on Moles with Answer Key, Exercises of Chemistry

Gettysburg CollegeChemistry

13 simple chemistry numerical calculating moles

Typology: Exercises

2020/2021

Uploaded on 04/20/2021

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Worksheet on Moles
Three conversions to remember about chemicals โ€“ usually used when we are asking about just one chemical:
1. How many atoms are in 40.08 grams of calcium?
2. One mole of magnesium would contain how many atoms?
3. How many atoms are in 5.55 moles of silver?
4. How many moles are in 5.55 x 1033 molecules of H2SO4?
5. What is the molar mass of sodium carbonate?
6. What is the molar mass of nickel(III) sulfate?
7. How many moles are in 88.88 grams of calcium?
8. How many grams is 1.25 moles of potassium bromide?
9. 3.50 grams of gold would contain how many atoms?
10. How many liters is 0.975 moles of laughing gas at STP?
11. How many liters is 3.59 x 1019 atoms of argon gas at STP?
12. What is the percent oxygen in sulfuric acid, H2SO4?
13. What is the percent hydrogen in water?
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Worksheet on Moles

Three conversions to remember about chemicals โ€“ usually used when we are asking about just one chemical:

  1. (^) How many atoms are in 40.08 grams of calcium?
  2. (^) One mole of magnesium would contain how many atoms?
  3. (^) How many atoms are in 5.55 moles of silver?
  4. (^) How many moles are in 5.55 x 10^33 molecules of H 2 SO 4?
  5. (^) What is the molar mass of sodium carbonate?
  6. (^) What is the molar mass of nickel(III) sulfate?
  7. (^) How many moles are in 88.8 8 grams of calcium?
  8. (^) How many grams is 1.25 moles of potassium bromide?
  9. (^) 3.50 grams of gold would contain how many atoms?
  10. How many liters is 0.975 moles of laughing gas at STP?
  11. How many liters is 3.59 x 10^19 atoms of argon gas at STP?
  12. What is the percent oxygen in sulfuric acid, H 2 SO 4?
  13. What is the percent hydrogen in water?

Answers

  1. 40.08 grams of calcium is one mole (see Periodic Table), and one mole is 6.02 x 10^23 atoms.
  2. One mole of anything is 6.02 x 10^23 , so it is 6.02 x 10^23 Mg atoms.
  3. 5.55 mol Ag (
    1. 02 ๐‘ฅ 1023 ๐‘Ž๐‘ก๐‘œ๐‘š๐‘  1 ๐‘š๐‘œ๐‘™ ) = 3.34 x 10^24 atoms Ag
  4. 5.55 x 10^33 molecules ( 1 ๐‘š๐‘œ๐‘™
  5. 02 ๐‘ฅ 1023 ๐‘š๐‘œ๐‘™๐‘’๐‘๐‘ข๐‘™๐‘’๐‘  ) = 9.22 x 10^9 moles H 2 SO 4
  6. Na 2 CO 3 adding up the masses of all the atoms = 105.99 g/mol
  7. Ni 2 (SO 4 ) 3 is 405.59 g/mol
  8. 88.8 8 g Ca ( 1 ๐‘š๐‘œ๐‘™
  9. 08 ๐‘” ) = 2.218 mol Ca
  10. 1.25 mol KBr (
    1. 00 ๐‘” 1 ๐‘š๐‘œ๐‘™ ) = 149 grams
  11. 3.50 g Au ( 1 ๐‘š๐‘œ๐‘™
  12. 97 ๐‘”

  1. 02 ๐‘ฅ 1023 ๐‘Ž๐‘ก๐‘œ๐‘š๐‘  1 ๐‘š๐‘œ๐‘™ ) = 1.07 x 10^22 atoms Au

  2. 0.975 mol (

    1. 4 ๐ฟ 1 ๐‘š๐‘œ๐‘™ ) = 21.8 L gas

  3. 3.59 x 10^19 atoms Ar ( 1 ๐‘š๐‘œ๐‘™

  4. 02 ๐‘ฅ 1023 ๐‘Ž๐‘ก๐‘œ๐‘š๐‘ 

  1. 4 ๐ฟ 1 ๐‘š๐‘œ๐‘™ ) = 0.00134 L Ar gas

  2. Four oxygens = 64.00 grams, H 2 SO 4 total = 98.09 grams. So percent oxygen is (

    1. 00 ๐‘”
    2. 09 ๐‘” ) x 100% = 65.2 5 %

  3. Two hydrogens in water = 2.02 grams, H 2 O = 18.02 grams So percent H is (

    1. 02 ๐‘”

  4. 02 ๐‘” ) x 100% = 11.2%