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Gram Formula Mass (Molar Mass)

Gram Formula Mass (Molar Mass). Unit 6 - Bonding. Gram Formula Mass. How many atoms of each element are in a formula unit of each compound? NaCl 1 Na and 1 Cl Fe 2 O 3 2 Fe and 3 O (NH 4 ) 2 S 2 N, 8 H, 1 S Al 2 (SO 4 ) 3 2 Al, 3 S, 12 O. Gram Formula Mass.

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Gram Formula Mass (Molar Mass)

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  1. Gram Formula Mass(Molar Mass) Unit 6 - Bonding

  2. Gram Formula Mass • How many atoms of each element are in a formula unit of each compound? • NaCl • 1 Na and 1 Cl • Fe2O3 • 2 Fe and 3 O • (NH4)2S • 2 N, 8 H, 1 S • Al2(SO4)3 • 2 Al, 3 S, 12 O Free Template from Brainybetty.com

  3. Gram Formula Mass • GFM – mass (in grams) of 1 mole of an ionic compound (molar mass) • Just add up all of the pieces of the compound… Free Template from Brainybetty.com

  4. Gram Formula Mass • NaCl 22.99 + 35.45 = 58.44 g/mol • Fe2O3 2(55.85) + 3(16.00) = 159.70 g/mol Free Template from Brainybetty.com

  5. Gram Formula Mass • (NH4)2S 2(14.01) + 8(1.01) + 32.07 = 68.17 g/mol • Al2(SO4)3 2(26.98) + 3(32.07) + 12(16.00) = 342.17 g/mol Free Template from Brainybetty.com

  6. GFM Calculations • Now use the calculated GFM to do mole conversions. • Like… • How many moles is ____ g of _____? • What is the mass of ____ mole of ____? Free Template from Brainybetty.com

  7. GFM Calculations • How many moles is 2.63 g of NaCl? • What is the mass of 3.78 moles of Fe2O3? 2.63 g NaCl 1 mol NaCl = 0.0450 mol NaCl 58.44 g NaCl 3.78 mol Fe2O3 159.70 g Fe2O3 = 604 g Fe2O3 1 mol Fe2O3 Free Template from Brainybetty.com

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