Among the following, what has a molecular mass of 44 u?
CO2
Add the atomic masses in each formula: N2 = 2 × 14 = 28 u, H2O = (2 × 1) + 16 = 18 u, NH3 = 14 + (3 × 1) = 17 u.
For carbon dioxide, CO2 = 12 + (2 × 16) = 12 + 32 = 44 u, which is the value asked for.
Hence, the answer is CO2.
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