Given that the atomic masses of C = 12 u, O = 16 u and H = 1 u, which of the following options correctly represents the molecular masses of CO2 and H2O?
CO2 = 44 u ; H2O = 18 u
The molecular mass of a compound is the sum of the atomic masses of every atom in its formula.
For carbon dioxide, CO2 contains 1 carbon and 2 oxygen atoms: \(1\times 12 + 2\times 16 = 12 + 32 = 44\) u.
For water, H2O contains 2 hydrogen and 1 oxygen atom: \(2\times 1 + 1\times 16 = 2 + 16 = 18\) u.
Hence, CO2 = 44 u and H2O = 18 u.
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