Molar Mass of ionic compounds

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Presentation transcript:

Molar Mass of ionic compounds

Molar Mass Molar mass- same as atomic mass but for a compound rather than an atom. To determine the molar mass of any compound you add up the atomic mass of all atoms present. NaCl 22.99 + 35.45 = 58.44 g/mol (amu)

Molar mass with subscript numbers Subscript numbers mean there are that many of that atom. CaI2 40.08 + 126.9 + 126.9 = or you can multiply 40.08 + 126.9 x 2 = = 293.88 g/mol (amu)

Molar Mass with parentheses Parentheses and a subscript number mean there are that many of everything in the parentheses Be(OH)2 9.012 + (16.00 + 1.008) x 2 = 9.012 + (17.008) x 2 = 9.012 + 34.016 = 43.028 g/mol

Combining all of them (NH4)2CO3 (14.01 + 1.008 x 4) x 2 + 12.01 + 16.00 x 3 (14.01 + 4.032) x 2 + 12.01 + 48 (18.042) x 2 + 60.01 36.084 + 60.01 =96.094 g/mol

Converting between moles and grams using molar mass

Converting between moles and grams molar mass is the conversion factor that many grams equal one mole of the substance! so 64 g of NaCl 64 g NaCl 1 mole NaCl 58.44 g NaCl = 1.1 mol NaCl

Homework How many grams are in 2.3 mol of Co(ClO3)3?