9th Edition

ISBN: 9781133949640

Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher: Cengage Learning

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Textbook Question

Chapter 5, Problem 96IL

Insoluble PbBr₂(s) precipitates when solutions of Pb(NO₃)₂(aq) and NaBr(aq) are mixed.

Pb(NO₃)₂(aq) + 2 NaBr(aq) → PbBr₂(s) + 2 NaNO₃(aq)

Δ_rH° = ?

To measure the enthalpy change, 200. mL. of 0.75 M Pb(NO₃)₂(aq) and 200. mL of 1.5 M NaBr(aq) are mixed in a coffee-cup calorimeter. The temperature of the mixture rises by 2.44 °C. Calculate the enthalpy change for the precipitation of PbBr₂(s), in kJ/mol. (Assume the density of the solution is 1.0 g/mL., and its specific heat capacity is 4.2 J/g · K.)

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Chapter 5 Solutions

Chemistry & Chemical Reactivity

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