1. The problem statement, all variables and given/known data An ideal gas expands from the state (p_1, V_1 ) to the state (p_2, V_2 ), where p_2 = 2p_1 and V_2 = 2V_1. The expansion proceeds along the straight diagonal path AB shown in the figure. Find an expression for the work done by the gas during this process. Express your answer in terms of the variables p_1 and V_1. 2. Relevant equations W = (p_1 V_1 - p_2 V_2) / (y - 1) 3. The attempt at a solution I put the equation exactly with y = 1.4. Masteringphysics says "Your answer either contains an incorrect numerical multiplier or is missing one.". What have I done wrong?