What steps do I need to use to solve this gas thermochemistry problem?

Question

A sample of an ideal gas at 15.0 atm and 10.0L is allowed to expand against a constant external pressure of 2.00atm at a constant temperature. Calculate the work in units of kJ for the gas expansion

Answer 1

STEPS:

1.  Recognize the equation w = P∆V

2.  Substitute values and calculate w

3.  Recall that 1 L-atm = 101.325 J = 0.101325 kJ