In a constant pressure process for 3 mole of an ideal monoatomic gas, the temperature of the gas increases from 200 K to 400 K. Which of the following is incorrect regarding the process?

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Δ T = 200 K. Δ H = 3 × 2 5 ​ R × 200 = 1500 R : (A) correct. Δ U = 3 × 2 3 ​ R × 200 = 900 R : (B) correct. At constant pressure q = Δ H = 1500 R , so q = 900 R is incorrect: (C). w = − n R Δ T = − 600 R : (D) correct. Answer: (C).

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