Determine the molecular formula of an alkane, the mass fraction of carbon in which is 81.82
| November 30, 2020 | education
W is the mass fraction of the substance.
Given: W (C) = 81.82%.
Solution: W (H) = 100% – 81.82% = 18.18%.
W (C) / Ar (C) ÷ W (H) / Ar (H) = 81.82% / 12 (g / mol) ÷ 18.18% / 1 (g / mol) = 6.81 ÷ 18, 18 = 1 ÷ 2.66 = 3 ÷ 7.89 = 3 ÷ 8 => alkane formula – C3H8.
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