1. The problem statement, all variables and given/known data 60 L of N2 are collected over H2O at 40oC when atmospheric pressure is 760.00 torr. What is partial pressure of N2? 2. Relevant equations PV=nRT Pt=P1+P2... Vapor pressure of H2O at 40oC:7.3590 KPa 760 torr=101.3 kPa 40oC=313oK 3. The attempt at a solution PV-nRT (60)101.3=313(n)8.3145 ((60)101.3)/((313)8.3145)=2.166g....That doesn't help, mass of H2O unknown. Pt=P1+P2? Pt=101.3kPa+PN...Pt is not given....doesn't work. Cannot assume Pt is ambient pressure because container's height affects pressure.