Explain the standard entropy of reaction

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Standard molar entropies, S^o, in J/Kmol, are given below each reactant and product in the reaction shown below. The standard entropy of reaction, deltaS^o, for this reaction is _________J/K. S(s,rhombic)+O2(g)----SO2(g) 31.8, 205.0, 248.1 respectively

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