The partial pressure for the gases is as below
CH₄=0.547 atm
C₂H₆= 0.441 atm
C₃H₈ =0.512 atm
calculation
partial pressure of a gas=[ (moles of the gas/ total moles) x total pressure]
Total moles = moles of ( CH₄ + C₂H₆ + C₃H₈) =0.31 + 0.25 +0.29 = 0.85 moles
Total pressure = 1.5 atm
partial pressure for CH₄ = (0.31/0.85) x 1.5 atm=0.547 atm
Partial pressure for C₂H₆ =( 0.25 /0.85) x 1.5 atm = 0.441 atm
partial pressure for C₃H₈ =(0.29/0.85) x 1.5 atm =0.512 atm
