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Question 1 a) Clapeyron equation is widely used to determine the enthalpy/entropy change of vaporization. For 1-butene it determines the entropy change of vaporization value of 45.145 J/mol at 90C. It is required to determine the second virial coefficient in cm /mol for 1- butene at the given temperature. The vapor pressure equation is given as follows: 4350.2 2 Inpsat (Pa) = 68.49 - 7.4124 InT + 1.0503 x 10-572 + T2 where T is in K