A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its…

A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.
[C = 12, H = 1]
  • A.
    C2H6
  • B.
    C3H8
  • C.
    C3H4
  • D.
    C6H6
Correct Answer: Option D
Explanation

molecular mass = 2 x vapour density
= 2 x 39 = 79
∴ Cn Hn = 78
12n + 1n = 78
13n = 78
n = (frac{78}{13}) = 6
∴ Cn Hn = C 6H 6

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