A vessel contains air and vapor H2O, if the partial pressure of vapor H2O is 4 atm and pressure of air is 1 atm, what is the fraction of vapor H2O in vessel?

A vessel contains air and vapor H2O, if the partial pressure of vapor

1.	A vessel contains air and vapor H₂O, if the partial pressure of vapor H₂O is 4 atm and pressure of air is 1 atm, what is the fraction of vapor H₂O in vessel?
A.	t0.25
B.	t0.5
C.	t0.75
D.	t0.8
Answer» D. t0.8