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10 September, 15:35

A 2.20 g sample of a compound gave 5.63 g CO2 and 2.30 g H2O on combustion in air. The compound is known to contain only C, H, O. What is its simplest formula?

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  1. 10 September, 15:39
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    The simplest formula is C₅H₁₀O.

    We must calculate the masses of C, H, and O from the masses given.

    Mass of C = 5.63 g CO₂ * (12.01 g C/44.01 g CO₂) = 1.536 g C

    Mass of H = 2.30 g H₂O * (2.016 g H/18.02 g H₂O) = 0.2573 g H

    Mass of O = Mass of compound - Mass of C - Mass of H

    = (2.20 - 1.536 - 0.2573) g = 0.406 g

    Now, we must convert these masses to moles and find their ratios.

    From here on, I like to summarize the calculations in a table.

    Element Mass/g Moles Ratio Integers

    C 1.536 0.1279 5.038 5

    H 0.2573 0.2553 10.05 10

    O 0.406 0.0254 1 1

    The empirical formula is C₅H₁₀O.
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