At T ( K ) , a gaseous mixture of H ₂ and O ₂ containing 20 % (weight/weight) of H ₂ exerts a total pressure of 2 bar. What is the partial pressure of O ₂ (in bar)?

Step-by-step solution

P _ total =2 bar, P _ O ₂ = x _ O ₂ P _ total For 100 ~g of this gaseous mixture, W ( H ₂ )=20 ~g , W( . O ₂ )=80 ~g . n _ H ₂ = 20 2 =10 ~mol , n _ O ₂ = 80 32 =2.5 ~mol x _ O ₂ = 2.5 2.5+10 =0.2 P _ O ₂ =0.2 2=0.4 bar