Question

Equal masses of ethane and hydrogen are mixed in an empty container at $25{}^{o}C$. The fraction of the total pressure exerted by hydrogen is:

• A. 1 : 2
• B. 1 : 1
• C. 1 : 16
• D. 15 : 16

Answer 1

The correct option is D 15 : 16

$\frac{p_{H_2}}{p_{total}}=x_{H_2}$

$=\frac{n_{H_2}}{n_{H_2}+n_{C_2{H}_6}}$

$=\frac{\frac{W}{2}}{\frac{W}{2}+\frac{W}{30}}=\frac{15}{16}$