Q.

An ideal gaseous mixture of ethane (C2H6) and ethene (C2H4) occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 gm O2 to produce CO2 and H2O. Mole fraction at C2H4 in the mixture is:

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a

0.6

b

0.4

c

0.5

d

0.8

answer is A.

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Detailed Solution

Moles of C2H6 and C2H4 are a and brespectively.a+b=2822.4=1.25C2H6(g)+3.5O2(g)⟶a3.5a⟶ C2H4(g)+3O2(g)⟶b              3bCO2(g)+3H2O(l)Moles of O2 = 3.5a +3b = 4 (since mO2=128g)a+b =1.25 a = 0.5 b= 0.75
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