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Solids have lower molar entropy than liquids, and liquids have lower molar entropy of gases. In the gas phase, a compound has the highest molar entropy. I think there will be a decrease in entropy for this equation, because of the conversion of a gas and a liquid which have high molar entropy, into an aqueous solution.
Also, when the number of molecules decreases, translational and rotational degrees of freedom are converted to vibrational degrees of freedom, which contribute less to entropy, and therefore entropy decreases.
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