Question

Four moles of hydrogen gas (assumed to be ideal gas) are initially at a state of P = 20 atm and V = 5 liters. This gas system is then experienced a reversible process along a circular path of (V-10)^2 + (P-20)^2 = 25 in the P-V space. The process starts from the state of P = 20 atm and V = 5 liters, moves in a clockwise direction along the circular path, and at the end returns back to the state of P = 20 atm and V = 5 liters. Please calculate the amount of work done by the gas system as a result of this reversible process.