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# Calculate an Equilibrium Constant based on Enthalpy and Entropy

CHEM-480EKY

For the following reaction $NH_{4}NO_{3}(s) \leftrightarrow NH_{4}^{+}(aq) + NO_{3}^{-}(aq)$, $\Delta H^{\circ}=28.05 \space kJ/mol$ and $\Delta S^{\circ}=108.7 \space J/mol K$.

What is the equilibrium constant at $25^{\circ}C$ for this reaction?

A

$5.76$

B

$-5.76$

C

$0.174$

D

$1$