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Problem 98

Propylene (propene; $\mathrm{CH}_{3} \mathrm{CH}=…

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Problem 97

Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam.
(a) Find $\Delta H_{\mathrm{rxn}}^{\circ}, \Delta G_{\mathrm{rxn}}^{\circ}$ and $\Delta S_{\mathrm{rxn}}^{\circ},$ given these data at $298 \mathrm{K} :$
(b) At what temperature is the reaction spontaneous?
(c) What are $\Delta G_{\text { rxn }}^{\circ}$ and $K$ at $600 .$ C?
(d) What 5.0 parts steam to 1.0 part ethylbenzene in the reactant mixture and the total pressure kept constant at 1.3 atm, what is $\Delta G$ at $50 . \%$ conversion, that is, when $50 . \%$ of the ethylbenzene has reacted?

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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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