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Solution The answer: The ratio of Hydrogen: Oxygen is 1:16 The molar mass of hydrogen peroxide is 34.01468 g/ mol. Hydrogen has an atomic mass of 1.00794 g/mol oxygen's atomic mass is 15.9994 g/mol. There are two atoms of each element in hydrogen peroxide, so multiply these atomic masses by 2, and then add the products together. 1.00794 g/mol x 2 = 2.01588 g/mol or 2 g/mol 15.9994 g/mol x 2 = 31.9988 g/mol or 32 g/mol So the ratio for Hydrogen and Oxygen is 2: 32, that is equal to 1: 16.
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