13. One mole of an ideal gas expands slowly and isothermally at temperature T until its volume is doubled. The change of entropy of this gas for this process is:
(A) Rln2
(B) ln2/T
(C) 0
(D) RTln2
(E) 2R
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統計: A(1), B(0), C(0), D(0), E(0) #3384047
統計: A(1), B(0), C(0), D(0), E(0) #3384047