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Gram Formula Mass (Molar Mass) Unit 6 - Bonding

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7/3/2015Free Template from Brainybetty.com2 Gram Formula Mass How many atoms of each element are in a formula unit of each compound?How many atoms of each element are in a formula unit of each compound? –NaCl 1 Na and 1 Cl1 Na and 1 Cl –Fe 2 O 3 2 Fe and 3 O2 Fe and 3 O –(NH 4 ) 2 S 2 N, 8 H, 1 S2 N, 8 H, 1 S –Al 2 (SO 4 ) 3 2 Al, 3 S, 12 O2 Al, 3 S, 12 O

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7/3/2015Free Template from Brainybetty.com3 Gram Formula Mass GFM – mass (in grams) of 1 mole of an ionic compound (molar mass)GFM – mass (in grams) of 1 mole of an ionic compound (molar mass) Just add up all of the pieces of the compound…Just add up all of the pieces of the compound…

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7/3/2015Free Template from Brainybetty.com4 Gram Formula Mass NaClNaCl 22.99 + 35.45 = 58.44 g/mol Fe 2 O 3Fe 2 O 3 2(55.85) + 3(16.00) = 159.70 g/mol

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7/3/2015Free Template from Brainybetty.com5 Gram Formula Mass (NH 4 ) 2 S(NH 4 ) 2 S 2(14.01) + 8(1.01) + 32.07 = 68.17 g/mol Al 2 (SO 4 ) 3Al 2 (SO 4 ) 3 2(26.98) + 3(32.07) + 12(16.00) = 342.17 g/mol

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7/3/2015Free Template from Brainybetty.com6 GFM Calculations Now use the calculated GFM to do mole conversions.Now use the calculated GFM to do mole conversions. Like…Like… How many moles is ____ g of _____?How many moles is ____ g of _____? What is the mass of ____ mole of ____?What is the mass of ____ mole of ____?

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7/3/2015Free Template from Brainybetty.com7 GFM Calculations 1.How many moles is 2.63 g of NaCl? 2.What is the mass of 3.78 moles of Fe 2 O 3 ? 2.63 g NaCl 58.44 g NaCl 1 mol NaCl =0.0450 mol NaCl 3.78 mol Fe 2 O 3 1 mol Fe 2 O 3 159.70 g Fe 2 O 3 =604 g Fe 2 O 3

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