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Molar mass and percent composition

Molar mass and percent composition. Remember…. A formula tells how many AND what types of atoms are in a compound! % composition is an important tool/concept to know – EX: determining or knowing the % composition of a metal in a mineral helps to decide if it should be mined.

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Molar mass and percent composition

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  1. Molar mass and percent composition

  2. Remember…. • A formula tells how many AND what types of atoms are in a compound! • % composition is an important tool/concept to know – EX: determining or knowing the % composition of a metal in a mineral helps to decide if it should be mined

  3. Determine the % comp of elements in a compound • Determine the % Mn in MnCO3. • Steps to solve problem: • 1. determine the total mass of the “main” element • 2. determine the molar mass of the compound • 3. Find the % - You will use the % comp formula you previously learned.

  4. % of Mn in MnCO3 Mn: 54.94 x 1 = 54.94** C: 12.01 x 1 = 12.01 O: 16.00 x 3 = 42.00 114.95 x 100 = 47.79% Mn in the compound

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