Mole ConceptHard

Question

An organic compound contains 40% carbon and 6.67% hydrogen by mass. Which of the following represents the empirical formula of the compound?

Options

A.CH2
B.CH2O
C.C2H4O
D.CH3O

Solution

Mass per cent of oxygen = 100 − (40 + 6.67) = 53.33

Now, NC: NH: NO = $\frac{40}{12}:\frac{6.67}{1}:\frac{53.33}{16} = 1:2:1$

⇒ Empirical formula = CH2O

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