Question

A gaseous mixture of h2 and O2 at 60°C and total pressure of 2.5 atmosphere contain 75 mole % h2 what are the partial pressure of both gases in the mixture?

Answer 1

If the mole fraction of H₂ is 75% (or 0.75), the mole fraction of O₂ equals 1 - 0.75 = 0.25. Therefore,

$P_{H_2}=\chi_{H_2}\times{P_{total}}=0.75\times2.5=1.9atm$

$P_{O_2}=\chi_{O_2}\times{P_{total}}=0.25\times2.5=0.63atm$

Answer: H₂ - 1.9 atm; O₂ - 0.63 atm