Which of the following processes would you expect to have a negative value for entropy? NaCl(s) Na+(aq) + Cl- (aq) H2O(s) H2O(l) NaCl(s) NaCl(l) 2 Al(s) + 3Br2(l) 2AlBr3(s) C2H5OH(l) C2H4(g) + H2O(g)

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Negative changes in entropy is associated with reactions that go from a more disordered state to a more ordered state. In this case, it will be the chemical reaction: 2 Al(s) + 3Br2(l) -> 2AlBr3(s) This is because we have a mixture (high entropy) being reacted to form a solid (lower entropy).

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