Thermodynamics question...

Two moles of an ideal gas at 7 atm pressure
occupies 3 L. The gas is allowed to expand
at constant pressure to a volume of 6.5 L.
It is then cooled at constant volume until
its pressure is 5.3 atm. The universal gas
constant is 8.314 J/mol · K; 1 atm = 101300
Pascals; 1 m3
= 1000 liters.
Calculate the work done by the gas.
Answer in units of J

Work done by an expanding gas at constant pressure:
W = P*(V2 - V1)

W = 24.5 Liter-atmospheres

Convert to Joules:
1 Liter-atmosphere = 101.325 Joules

Result:
W = 2482 Joules

Note: we don't need to care what the flavor of gas or temperature is.