Mole ConceptHard

Question

A certain vitamin extracted from plant sources has carbon and hydrogen in 8: 1 mass ratio. The percentage of oxygen is nearly 7.3. The compound gave no test for nitrogen or sulphur or any other element. What should be the empirical formula of the compound?

Options

A.C30H45O2
B.C15H23O
C.C29H45O3
D.C10H15O

Solution

Mass per cent of C =$\frac{8}{9} \times 92.7$= 82.4%

Mass per cent of H =$\frac{1}{9} \times 92.7$= 10 3%

Now, NC: NH: NO =$N_{C}:N_{H}:N_{O} = \frac{82.4}{12}:\frac{10.3}{1}:\frac{7.3}{16}$ = 30: 45: 2

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