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Get Full Access to An Introduction To Thermal Physics - 1 Edition - Chapter 5 - Problem 90p
Get Full Access to An Introduction To Thermal Physics - 1 Edition - Chapter 5 - Problem 90p

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# When solid quartz “dissolves” in water, it combines with

ISBN: 9780201380279 40

## Solution for problem 90P Chapter 5

An Introduction to Thermal Physics | 1st Edition

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Problem 90P

Problem 90P

When solid quartz “dissolves” in water, it combines with water molecules in the reaction.

a) Use this data in the back of this book to compute the amount of silica dissolved in waler in equilibrium with solid quartz, at 25°C.

b) Use the van’t Hoff equation (below Problem) to compute the amount of silica dissolved in water in equilibrium with solid quartz at 100°C.

Problem:

Derive the van’t Hoff equation,

which gives the dependence of the equilibrium constant on temperature. Here ΔH° is the enthalpy change of the reaction, for pure substances in their standard states (1 bar pressure for gases). Notice that if ΔH° is positive (loosely speaking, if the reaction requires the absorption of heat), then higher temperature makes the reaction tend more to the right, as you might expect. Often you can neglect the temperature dependence of Δ; solve the equation in this case to obtain

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