11. At constant pressure, when temperature increases, Gibbs free energy (A)always increases (B)always decreases (C)does not change (D)increases following by decreasing

8. About ideal gas, (A)An ideal gas is an assemblage of volumeless noninteracting particles which obeys the ideal gas law, PV = RT. (B)The internal energy of an ideal gas arises solely from the translational motions of the gas particles and hence is a function only of temperature, (C)The enthalpy of an ideal gas is a function only of temperature, (D)The internal energy U is constant with respect to the gas volume, i.e. (dU/dV)T = 0, hence the pressure P can be expressed as P = (dS/dV)T, (E)The above are all correct.

11. At constant pressure, when temperature increases, Gibbs free energy
(A)always increases
(B)always decreases
(C)does not change
(D)increases following by decreasing

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