A rigid cylinder is filled with a gaseous mixture containing exactly equal masses of carbon monoxide — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Since the molar mass of $CO$ ($12+16=28\text{ g/mol}$) is identical to the molar mass of $N_2$ ($28\text{ g/mol}$), equal masses imply equal numbers of moles. Therefore, $n_{CO} = n_{N_2}$, meaning $\chi_{CO} = \chi_{N_2} = 0.5$. Because $p_i \propto n_i$, their partial pressures are equal, and the ratio is $1:1$. Option D is false as total pressure depends on total moles, which relies on molar mass.