The heat capacity at constant pressure of hydrogen cyanide
Chapter 8, Problem 8.2(choose chapter or problem)
The heat capacity at constant pressure of hydrogen cyanide is given by the expression Cp[J/(mol'C)] = 35.3 + 0.0291T(C) (a) Write an expression for the heat capacity at constant volume for HCN, assuming ideal gas behavior. (b) Calculate LiH(1/mol) for the constant-pressure process HCN(v. 25C, 0.80 atm) -,> HCN(v. 100C, 0.80 atm) (c) Calculate LiO(1/mol) for the constant-volume process HCN(v. 25C, 50 m3 /kmol) -> HCN(v, 100C, 50 m3 /kmol) (d) If the process of part (b) were carried out in such a way that the initial and final pressures were each 0.80 atm but the pressure varied during the heating, the value of LiH would still be what you calculated assuming a constant pressure. Why is this so?
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