Based on the general molecular formula of alkanes, deduce the formula by which
| September 7, 2021 | education
Based on the general molecular formula of alkanes, deduce the formula by which you can calculate the mass fraction of hydrogen in any alkane.
The general formula of alkanes is CnH2n + 2, from it you can deduce the mass fraction of hydrogen, knowing the relative atomic masses of carbon (12) and hydrogen (1). The alkane mass is 12 * n + 2 * n + 2 = 14 * n + 2, the hydrogen fraction is (2 * n + 2) / (14 * n + 2) = (n + 1) / (7 * n + 1 ), where n is the number of carbon atoms.
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