A mixture of 25% O2, 35% N2 and 40% CO2 by mass exerts a total pressure of 700mm Hg. The partial pressures of these gases follows the order

Partial pressures are proportional to mole fraction of gas or number of moles of the gas.Let total mass =100gmnO2=2532; nN2=3528; nCO2=4044;nO2=0.78125; nN2=1.25; nCO2=0.91; pN2>pCO2>pO2 ;