Set 6 - Chem 3433 Problem Set 6 - Due before class on...

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Chem 3433 – Problem Set 6 - Due before class on 10/12/11 1. (freshman) Liquid ammonia (b.p. -33.4 C) can be used as a refrigerant and heat transfer fluid. How much energy is needed to heat 25 g of NH 3 (l) (17 g/mol) from -65.0 C to -12.0 C? Specific heart capacity NH 3 (l) 4.7 J/(g K) Specific heart capacity NH 3 (g) 2.2 J/(g K) Heat of vaporization 23.5 kJ/mol 2. Phase equilibrium occurs when the chemical potential of each phase is equal. Thus, g l , which also means that dP V dT S dP V dT S g g l l . From this starting point show that you can obtain V S dT dP , be sure to define the deltas. For a liquid to gas transition, we can equate V with g V . Using an ideal gas, this expression can be integrated to get the standard equation one sees in an undergraduate textbook. 2a. Starting with the equality of the chemical potentials, show how the standard form one sees in an undergraduate textbook is obtained. 2b.
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This note was uploaded on 10/11/2011 for the course CHE 3433 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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