Chapter 2 Problems 2.19The path followed by a gas during a particular mechanically reversible process is described by the equation P+aV = c where a and c are constants: In the initial state, P₁ = 60 bar and V₁₁ = 0.002 m3; in the final state, P₂ = 20 bar and V₂ = 0.004 m³. During the process, heat in the amount of 5,000 J is transferred to the gas. Determine W and AU for the process. Suppose the gas followed a different path connecting the same initial and final states. Which of the quantities Q, W, and AUt must be unchanged? Why?