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20. The heat required to raise the temperature from 298 K to 398 K for 2 moles of a gas at constant volume is 4155 J. At constant pressure, the internal energy required to heat the same gas from 450 K to 550 K is 4960 J, and the gas does 857 J of work during this expansion. Which of the following statements is correct? (R = 8.31 J mol⁻¹ K⁻¹)
(A) This gas is monatomic.
(B) This gas is not an ideal gas.
(C) The molar heat capacity at constant volume 
is 41.55 J mol⁻¹ K⁻1.
(D) The molar heat capacity at constant pressure 
is 49.60 J mol⁻¹ K⁻1.
(E) The internal energy change is 2078 J when the gas is heated from 273 K to323 K at constant pressure
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統計： A(0), B(1), C(1), D(1), E(1) #3422491
統計： A(0), B(1), C(1), D(1), E(1) #3422491
