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Water - H2O

Find the atomic masses and add them together.

H: 1.00

H: 1.00

O: 16.0

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18.0 grams/mol

Take the atomic masses and divide it by the molecular mass to get % composition

Hydrogen: 2.00 ÷ 18.0 = 11.1%

Oxygen: 16.0 ÷ 18.0 = 88.9%

H2O contains 11.1% hydrogen and 88.9% oxygen

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16y ago

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