試題詳解

14. Suppose you add 45 J of heat to a system, let it do 10. J of expansion work, and then return the system to its initial state by cooling and compression. Which statement is true for this process?
(A) ΔΗ ＜ ΔΕ ;
(B) ∆H = 70. J ;
(C) The change in the internal energy for this process is zero.
(D) The work done in compressing the system must exactly equal the work done by the system in the expansion step. ;
(E) All the statements are false.