A 300 gram sample of water is allowed to vaporize completely

A 3.00 gram sample of water is allowed to vaporize completely in a 10.0L container. What is the pressure of the water vapor at a temperature of 250.0 degreee Celcius.

Solution

pv=nrt;

n=3/18=0.166

p*10=0.166*0.0821*(250+273)=7.1277 thus pressure =0.71277 atm