Chemistry - Thermodynamics - I Question with Solution | TestHub

The figure shows two P-V curves through one point, an isotherm (shallower) and an adiabat (steeper); the arrow points from the shallower toward the steeper curve. (a) Reversible expansion gives the maximum work by the gas, so (-w_rev) > (-w_irr): true. (b) Here w is work done on the gas (consistent with the -w used in (a) for work by the gas). Reversible compression needs the least work, so w_rev < w_irr: false. (c) For isothermal compression in stages with equal pressure steps Δ P, stage k does work nRT Δ P/P_k-1 on the gas, and this equals the heat rejected. It falls with k, so stage (n-1) rejects more heat than stage n takes work: true. (d) The arrow moves toward the steeper curve, which means increasing γ: false. Ans: (a), (c).