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Q.

30ml of a mixture of CH4 and C2H4 were burnt in excess of air. The volume of CO2 produced after explosion and cooling was 40ml. The composition of CH4 in the mixture is

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a

15 ml

b

20 ml

c

10 ml

d

25 ml

answer is B.

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Detailed Solution

Volume of gaseous mixture of CH4 and C2H4         = 30ml
Volume of CO2 liberated due to the combustion mixture   = 40ml
Let the volume of C2Hin the mixture be V ml then the Volume of CH4 in the mixture will be (30-V)ml
A) C2H4 + 3 O2 2 CO2 + 2H2O(l) 

From stoichiometry,

 CO2 obtained from “V” ml of Ethene = 2V ml

CH4 + 2 OCO2 + 2H2O(l)

From stoichiometry,

 CO2 obtained from (30 - V) ml of methane = (30 - V) ml

Total volume of CO2 formed = 2V+(30-V) = (30 + V)
Given 30 + V = 40
                 V = 10ml
 

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