Problem 85

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University of Miami

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Problem 84

$\mathrm{ABaSO}_{4}$ slurry is ingested before the gastrointestinal tract is $\mathrm{x}$ -rayed because it is opaque to $\mathrm{x}$ -rays and defines the contours of the tract. $\mathrm{Ba}^{2+}$ ion is toxic, but the compound is nearly insoluble. if $\Delta G^{\circ}$ at $37^{\circ} \mathrm{C}$ (body temperature) is 59.1 $\mathrm{kJ} / \mathrm{mol}$ for the process
$$\mathrm{BaSO}_{4}(s) \rightleftharpoons \mathrm{Ba}^{2+}(a q)+\mathrm{SO}_{4}^{2-}(a q)$$
what is $\left[\mathrm{Ba}^{2+}\right]$ in the intestinal tract? (Assume that the only source
of $\mathrm{SO}_{4}^{2-}$ is the ingested slurry.)

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Chapter 20
Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions
CHEMISTRY: The Molecular Nature of Matter and Change 2016

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