Gas is confined in a tank at a pressure of 11 ATM and a temperature of 25 degree Celsius. If 2/3 of the gas is withdrawn and the temperature is raised to 75 degree Celsius, what is the new pressure in the tank?

Answer 1

P V = n R T

11 = (n R/V) 298
so n R/V = 11/298

later
P V = (n/3) R T
3 P V = n R 348
so
n R/V = 3 P/348
but n R / V is still 11/298
so
(11/298)(348/3) = P

Answer 2

4.2804