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3題物化題目

1. An ideal gas expands reversibly and isothermally from 10 bar to 1 bar at 300 K. What are the values of (a) w per mole

(b) q per mole

(c) △U

(d) △H

(e)the ideal gas expands isothermally against a constant pressure of 1 bar. How much work is done on the gas?2. A mole of monatomic ideal gas at 1 bar and 273.15 K is expanded adiabatically against a constant pressure of 0.395 bar until equilibrium is reached.(a) What is the final temperature? (b) What is the final volume? (c) How much work is done on the gas in this process? (d) What is the change in the internal energy of the gas in the process?3. Ammonia gas is condensed at its boiling point at 1.01325 bar at -33.4℃ by the application of a pressure infinitesimally greater than 1 bar. To evaporate ammonia at its boiling point requires the absorption of 23.3 kJ mole-1. Calculate (a) wrev per mole

(b) q per mole

(c) △U

and (d) △H.請高手幫解QQ
1. (a) w = R*T*ln(Pf/Pi) = 8.314*300*ln(1/10) = -5743 J/mole Pf