A mixture of .250 moles O2, .297 moles N2, and .134 moles Ar has a total pressure of 1.95 atm. What is the mole fraction of O2 and what is the partial pressure of O2?

1 Answer

Answer:

Mole fraction = #0.367#
Partial pressure = #"0.716 atm"#

Explanation:

#"Mole fraction of a gas"=("Number of moles of gas")/("Total moles of gas")#

For #O_2#:

#"Mole fraction of"# #O_2#

#= 0.250/(0.250+0.134+0.297)=0.250/0.681~~0.367#

#"Partial pressure of a gas" = "Mole fraction" xx "Total pressure"#

For #O_2#:

#"Partial pressure of"# #O_2#

#= 0.367 xx "1.95 atm" ~~ 0.716# #"atm"#