when system is subdivided?Intensive variables: T, PExtensive variables: V, E, H, heat capacity C

1. One mole of an ideal gas initially at 27oC and 1 atm pressure is heated and allowed to expand reversibly at constant pressure until the final temperature is 327oC. For this gas, Cv=20.8 JK-1mol-1 and is constant over the temperature range. (R=0.08206 Latm K-1mol-1 = 8.314 JK-1mol-1 )

(a) Calculate the work w done on the gas in this expansion (b) What are and for the process ? (C) What is the amount of heat q absorbed by the gas ?

2. One mole of an ideal gas initially at 300 K is expanded from an initial pressure of 10 atm to a final pressure of 1 atm. Calculate and the final

temperature T2 for this expansion carried out according to each of the following paths. The molar heat capacity at constant volume for the gas is

Cv=3/2R. (a) An isothermal, reversible expansion (b) An expansion against a constant external pressure of 1 atm in thermally

isolated (adiabatic) system (c) An expansion against zero external pressure in an adiabatic system.

E H

, , ,E q w H