Estimate the standard molar entropy of 1.00 M aqueous Mg2+ using the following information: S for the reaction,Mg(s) + 2 HCl(aq) MgCl2(aq) + H2(g) ,is -43.02 J/K. 
A) "-52.1 J/K"
B) "+140.J/K"
C) "+138 J/K"
D) "-138 J/K"
E) "-140.J/K"
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