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Learning Objectives: To understand what is meant by the term, ‘relative molecular mass’

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M r is the relative molecular mass of a compound. This is the mass of the compound relative to the mass of 12 C. It is easy. Just add up the masses of the atoms in the molecule.

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Masses of Molecules Example H 2 contains 2 x hydrogen atoms. Hydrogen atoms have a relative mass of 1, so H 2 has a relative mass of: HHHH mass = 1 mass = 1 H 2 2 x 1 = 2g

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Masses of Molecules Example CO 2 contains 1 x carbon atom and 2 x oxygen atoms. carbon atoms have a relative mass of 12, and oxygen atoms have a relative mass of 16. The sum is:(1 x 12) + (2 x 16) = 12 + 32 = 44g COO 16 12 16

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Mass % and % Composition Mass % = grams of element grams of compound X 100 % 8.20 g of Mg combines with 5.40 g of O to form a compound. What is the mass.

Mass % and % Composition Mass % = grams of element grams of compound X 100 % 8.20 g of Mg combines with 5.40 g of O to form a compound. What is the mass.

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