Pluchino – Regents Chemistry The Mole & Stoichiometry – 02 % Composition & Hydration Aim: How can we determine the percent composition of a compound? Do Now: What % of water is made up of hydrogen? Explain your answer. Use percent composition by mass… H = 2 x 1 = 2 g/mol + O = 1 x 16 = 16 g/mol H 2 O = 18 g/mol 2 g/mol x 100 = 11.1% H 16 g/mol x 100 = 88.9% O 18 g/mol 18 g/mol Finding Percent Composition by Mass 1. Determine the mass contributed by each element in the compound. 2. Determine the molecular weight of the compound in total. 3. Divide the mass contributed by each element by the molecular weight of the compound.
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