Equal masses of CH4 (molar mass 16) and O2 (molar mass 32) are mixed in an empty container at 25 degC. The fraction of the total pressure exerted by O2 is

JEE Main levelSingle correct optionDifficulty 2 of 3ig015

Equal masses of $CH X_{4}$ (molar mass 16) and $O X_{2}$ (molar mass 32) are mixed in an empty container at $2 5^{\circ} C$ . The fraction of the total pressure exerted by $O X_{2}$ is

Take

w

g of each. Moles:

CH X_{4}

= w /16

O X_{2}

= w /32

x_{O X_{2}} = \frac{w /32}{w /16 + w /32} = \frac{1}{2 + 1} = \frac{1}{3}

. By Dalton's law

p_{O X_{2}} / P = x_{O X_{2}} = 1/3