Determine the molecular formula of a substance containing carbon (mass fraction 83.72%)

univerkov | June 2, 2021 | education

Determine the molecular formula of a substance containing carbon (mass fraction 83.72%) and hydrogen (16.28%) if the molecular mass of the substance is 86.

Using the formula for calculating the mass fraction of an element in the composition of a substance, we determine the molecular formula.
W% = Ar (element) * n * 100% / Mr (substance).
Ar (C) = 12.
Ar (H) = 1.
n (C) = W (C)% * Mr / Ar (C) * 100% = 83.72 * 86 / (12 * 100) = 6.
n (H) = W (H)% * Mr / Ar (H) * 100% = 16.28 * 86 / (1 * 100) = 14.
The formula of the substance С₆Н₁₄ is hexane.

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