Question

a system consisting of 1.5 mol CO2(g), initially at 15deg and 10 atm and confined to a cylinder of cross-section 10.0 cm2. it is allowed to expand adibatically against an external pressure of 1.0 atm until the piston has moved

Answer 1

until the piston has moved (HOW MUCH)

I don't see a follow up question.