10. What is the point group of C2H4?
(A) C 2v
(B) C2h
(C) D 2h
(D) D 2d .

簡答或推導題 (5 分)
 U 
Find   for a gas with the state equation of  p  a V  nRT , where a is a constant with
 V T
the unit of pressure. (Hint: dU  TdS  pdV , dA   SdT  pdV )

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