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Question

A hydrocarbon contains 17.2% of hydrogen and has a relative molecular mass of 58. Its molecular formula is:
(Given:  Atomic masses of: C = 12 g, H = 1 g)
  1. C2H5
  2. C2H4
  3. C4H10
  4. C4H8


Solution

The correct option is C C4H10
Element% wt.At. wt.Relative no. of molesSimple ratio of atomsC82.81282.8/12=6.96.96/6.9=1H17.2117.2/1=17.217.7/6.9=2.5
Empiricl formula of the compoud =C2H5
Empirical formula weight of hydrocarbon =2×12+5=29

Molecular wt.=n×Empirical formula
n=58/29=2

Empirical formula=C4H10

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