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Comprehensive Practice on Molar Mass Calculations

Master molar mass calculations with this comprehensive set of problems. Engage with varied scenarios including calculations for hydrogen gas (H2), copper sulfate (CuSO4), silver chloride (AgCl), water (H2O), and calcium phosphate (Ca3(PO4)2). Work through questions involving conversions from grams to moles and vice versa, and explore the relationships between moles, mass, and molecules. Perfect for chemistry students seeking to enhance their understanding of molar mass and stoichiometry.

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Comprehensive Practice on Molar Mass Calculations

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  1. Practice with Molar Mass Problems

  2. x 1 mol H2 2.02 g H2 :Question #1 How many moles of H2 are in 100 g of H2? # mol H2 = 100 g H2 = 49.5 mol H2

  3. x 1 mol CuSO4 159.61 g CuSO4 Question #2 300 g of CuSO4 is needed in an experiment. How many moles does this represent? # mol CuSO4 = 300 g CuSO4 = 1.88 mol CuSO4

  4. x 143.32 g AgCl 1 mol AgCl Question #3 A chemical reaction requires 23.78 moles of silver chloride. How many grams is this? # g AgCl = 23.78 mol AgCl = 3408 g AgCl

  5. x 6.02x1023 molecules 1 mol H2O x 1 mol H2O 18.02 g H2O Question #4 How many molecules are in 73 grams H2O? # H2O molecules = 73 g H2O = 2.4 x 1024 molecules H2O

  6. x 1 mol Ca3(PO4)2 310.18 g Ca3(PO4)2 Question #5 255 g of calcium phosphate are produced in a chemical reaction. How many moles of calcium phosphate does this represent? # mol Ca3(PO4)2 = 255 g Ca3(PO4)2 = 0.822 mol Ca3(PO4)2

  7. 2 mol H2O 18.01 g H2O 265 g H2O x x = 1 mol O2 1 mol H2O Question #6 According to the equation 2H2 + O2 2H2O, how many grams of H2O would be produced if 7.35 mol of O2 is used up? (hint: you will need two conversion factors – 1 from the balanced equation and 1 from a molar mass) # g H2O= 7.35 mol O2

  8. And you thought Chemistry was bad with factor-label problems!!??

  9. Complete the following chart (#7 - #13):

  10. Formula Molar mass (g/mol) Mass (g) Moles (mol) Complete the following chart (answers): FeSO4 151.9 500 3.29 (NH4)2CO3 96.1 192.2 2 SnO2 150.7 50 0.332 Sb2O5 323.6 80.9 0.25 NaClO4 122.4 100 0.817 Mg(IO3)2 374.1 1196.8 3.2 CoCl2.H2O 147.8 332 2.246

  11. Assignment 14. AgCl = 143.35 g/mol #g = 2 mol x 143.35 g/mol =286.7 g (2) 15. H2 = 2.016 g/mol #mol = 100 g x mol/2.016 g =49.6 mol (2) 16. CuSO4 = 159.62 g/mol #mol= 300 g x mol/159.62 g=1.879 mol (2) 17. KClO = 90.55 g/mol #mol = 250 g x mol/90.55 g =2.76 mol (2)

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