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Question

Calculate the volume of CO2 evolved by the combustion of 50 ml of a mixture contains C2H4 and 60% CH4 (by volume)

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Solution

50 ml mixture of C2H4 and CH4,
where CH4=50% of 60ml=30ml and C2H4=20ml.
applying limiting reagent law
C2H4 +CH4+5O23CO2+4H2O
(20x) (30x)3x
limiting reagent is C2H4
(20x)=0 and x=20
putting the value of x for CO2
the volume of CO2=3x=3×20=60ml

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