Answered: The molar volume of a certain solid is…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 10.80PAE

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a. The molar volume of a certain solid is 142.0 cm³ mol⁻¹ at 1.00 atm and 427.15 K, its melting temperature. The molar volume of the liquid at this temperature and pressure is 152.6 cm³ mol⁻¹. At 1.2 MPa the melting temperature changes to 429.26 K. Calculate the enthalpy (KJ/mol) and entropy of fusion (J/mol-K) of the solid.

b. Calculate the melting point of ice under a pressure of 10 MPa. Assume that the density of ice under these conditions is approximately 0.915 g cm⁻³ and that of liquid water is 0.998 g cm⁻³. From the result of the calculation, what happens when you increase the pressure on water, will it freeze or will the ice melt?

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