The heat capacity at constant pressure of hydrogen cyanide is given by the expression

Chapter 8, Problem 8.2

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QUESTION:

The heat capacity at constant pressure of hydrogen cyanide is given by the expression CpJ/molC 35:3 0:0291TC (a) Write an expression for the heat capacity at constant volume for HCN, assuming ideal-gas behavior. (b) Calculate H^(J/mol) for the constant-pressure process HCNv; 25C; 0:80 atm ! HCNv; 200C; 0:80 atm (c) Calculate U^(J/mol) for the constant-volume process HCNv; 25C; 50 m3 /kmol ! HCNv; 200C; 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 H^ would still be what you calculated assuming a constant pressure. Why is this so?

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QUESTION:

The heat capacity at constant pressure of hydrogen cyanide is given by the expression CpJ/molC 35:3 0:0291TC (a) Write an expression for the heat capacity at constant volume for HCN, assuming ideal-gas behavior. (b) Calculate H^(J/mol) for the constant-pressure process HCNv; 25C; 0:80 atm ! HCNv; 200C; 0:80 atm (c) Calculate U^(J/mol) for the constant-volume process HCNv; 25C; 50 m3 /kmol ! HCNv; 200C; 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 H^ would still be what you calculated assuming a constant pressure. Why is this so?

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