The procedure to solve this question
Q.149. A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K. The mixture reacts completely with $\frac{10}{3}$ mole of $O_2$ to produce $C{O}_2 and H_{2}O$. The mole fractions of ethane and ethene in the mixture are (R = 0.082 L atm $K^{-1}$ $mo{l}^{-1}$) respectively
(a) 0.50, 0.50
(b) 0.75, 0.25
(c) 0.67, 0.33
(d) 0.25, 0.75
(e) 0.33, 0.67