The mass fraction of carbon in the saturated monohydric alcohol is 47.4%. determine what kind

| May 27, 2021 | education

The mass fraction of carbon in the saturated monohydric alcohol is 47.4%. determine what kind of alcohol it is. write its structural formula and name it.

Saturated monohydric alcohols – alkanols – derivatives of alkanes with one hydroxyl group.

The general formula of saturated monohydric alcohols is CnH2n + 2O.

w (C) = M (C) / M (CnH2n + 2O).

Let us express the molar mass of alcohol through the general formula: 12 * n + 1 * (2 * n + 2) + 16.

47.4% = (12 * n * 100%) / (12 * n + 1 * (2 * n + 2) + 16).

47.4% = (1200% * n) / (14 * n + 18).

14 * n + 18 = (1200% * n) / 47.4%.

(25.3 * n) – (14 * n) = 18

11.3 * n = 18

N = 1.59.

This alcohol cannot exist, probably in the error condition. Because 100% – 47.4% = 52.6% – is more like the mass fraction of carbon in ethanol.

If it is ethanol, then the formula is CH3 – CH2 – OH.



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