Thermodynamics problems-part two

# Thermodynamics problems-part two - Thermodynamics problems...

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Thermodynamics problems-11/13/07 1. What happens to ΔU for a system during a process in which (a) q > 0 and w > 0, (b) q = w = 0, and (c) q < 0 and w > 0? 2. A system receives 93 J of electrical work, performs 227 J of pressure-volume work and releases 155 J of heat. What is the change in internal energy of the system? 3. (19 from text) A balloon filled with 39.1 mol of helium has a constant V of 876 L at 0.0 C and 1.00 atm. At constant P, the temperature of the balloon is increased to 38.0, causing the balloon to expand to a volume of 998 L. Calculate q, w, and E for the helium in the balloon. (the Molar heat capacity for helium gas is 20.8 J C -1 mol -1 . 4. (21 from text) One mole of H 2 O(g) at 1.00 atm and 100.0 C occupies a volume of 30.6 L. When one mole of H 2 O (g) is condensed to one mole of H 2 O (l) at 1.00 atm and 100.0 C, 40.66kJ of heat is released. If the density of H 2 O (l) at this temperature and pressure is 0.996 g/cm 3 , calculate E for the condensation of one mole of water at 1.00 atm and 100.0C. 5.

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## This note was uploaded on 10/31/2009 for the course CH 56435 taught by Professor Flowers during the Spring '08 term at University of Texas.

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Thermodynamics problems-part two - Thermodynamics problems...

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