# HW5 - Homework 5 Due by April 16 before class Problem 1 The...

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Homework 5: Due by April 16 before class Problem 1. The vapor pressure of liquid naphthalene is 1.3 kPa at 359K and 5.3 kPa at 392.5K. Assume that the naphthalene gas is an ideal gas, V g >> V l ( V is the molar volume) and H vap is temperature and pressure independent. Use the Clausius-Clapeyron equation to calculate (a) H vap , the enthalpy of vaporization for one mole of naphtalene (b) The boiling point at 1 atm (this is called the normal boiling point). Note that 1 atm = 101.3 kPa. (c) S vap , the entropy of vaporization for one mole of naphtalene at the boiling point in (b). Problem 2. H melt , the enthalpy of melting of one mole of mercury, is 2292 J. The melting point of mercury is 234.3 K at 1 bar and the volume change over the melting, V melt = V l - V s is 0.517 cm 3 /mol. Calculate the melting temperature at 1000 bar. Assume that H melt and V melt do not depend on pressure and temperature. Also assume that the temperature range of the solid-liquid phase boundary of mercury is very narrow. Problem 3.

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## This note was uploaded on 05/04/2010 for the course CH 43445 taught by Professor Lim during the Spring '10 term at University of Texas.

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HW5 - Homework 5 Due by April 16 before class Problem 1 The...

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