A volume V of a gaseous hydrocarbon was exploded with an excess of oxygen. The observed contraction was 2.5 V and on
treatment with potash, there was a further contraction of 2 V. What is the molecular formula of the hydrocarbon?
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Initial volume of Hydrocarbon =V ml
CxHy+(x+4y)O2→xCO2+4yH2O
xV2yV
on treatment with potash CO2 will absorb
xV=2V
x=2
Contration of volume 2.5 V is due to formula of H2O contract is due to decomponiter CxHy for moles of H2O but in H2O then the Hydrogen
V+4Vr=2.5 V
4V+Vy=10 V
Vy=6∣V
y=6
∴ Formula =C2H6 option A
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