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Which of the following changes has a decrease in entropy? . A.hg N2O4 (g) 2NO2 (g) B.3O2 (g) + 2KCl (s) 2KClO3 (s) C.C2H5OH (l) + 3O2 (g) 2CO2 (g) + 3H2O (g) D.H2O (l) H2O (g)

Curtis Rhodes

in Chemistry

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James Washington on January 31, 2019

The answer is B. 3O2 (g) + 2KCl (s) ---> 2KClO3 (s) This is a cut in the entropy, as we go from 5 moles of reactants to 2 mol of product. Also, one of the reactants is gas in the scenario, which implies that the entropy is really high-it equates to the product, which is in the solid phase.


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