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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
2VD = Rmm
VD = Vapour Density, Rmm = relative
2 × 20 − 40 molecular mass
Mole of carbon − 36/12
= 3
Mole of H2 = 40 − 36
= 4
The compound contains 3mole of carbon and 4 hydrogen