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Carbonic acid - H2CO3
Find the atomic masses of each element and multiply it by however many atoms are in the compound, then add them together.
H = 1.007 × 2 = 2.014
C = 12.01
O = 16.00 × 3= 48.00
Molecular mass = 2.014 + 12.01 + 48.00 = 62.02 grams/mole
Take the mass of a specific element (above) and divide it by the total molecular mass. Change the final answer to a percent
Hydrogen: 2.014 ÷ 62.02 = .0325 = 3.25%
Carbon: 12.01 ÷ 62.02 = .194 = 19.4%
Oxygen: 48.00 ÷ 62.02 = .774 = 77.4%
Carbonic acid contains 3.25% Hydrogen, 19.4% Carbon, and 77.4% Oxygen.
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