We have to use a so-called Gibbs equation:
"\\delta G^0=\\delta H^0-T \\delta S^0;"
From this, we will get the value of entropy:
"\\delta S^0=\\frac{\\delta H^0-\\delta G^0}{T}=\\frac{-184kJ-(-124kJ)}{217K}=-0.276kJ\/K(-276J\/K)."
Thus, the entropy of this reaction would be -276 J/K.
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