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Problem 61

As a fuel, $\mathrm{H}_{2}(g)$ produces only nonp…

University of Florida

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Problem 60

A reaction that occurs in the internal combustion engine is
$$\mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{NO}(g)$$
(a) Determine $\Delta H^{\circ}$ and $\Delta S^{\circ}$ for the reaction at 298 $\mathrm{K}$ .
(b) Assuming that these values are relatively independent of temperature, calculate $\Delta G^{\circ}$ at $100 .^{\circ} \mathrm{C}, 2560 .^{\circ} \mathrm{C},$ and $3540 .^{\circ} \mathrm{C} .$
(c) What is the significance of the different values of $\Delta G^{\circ} ?$
(d) At what temperature (in $\mathrm{K} )$ does the reaction become spontaneous?

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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