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For each of the following reactions, calculate ΔH∘rxn, ΔS∘rxn, ΔG∘rxn at 25 ∘C. State whether or...

For each of the following reactions, calculate ΔH∘rxn, ΔS∘rxn, ΔG∘rxn at 25 ∘C. State whether or not the reaction is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 ∘C?

2NH3(g)→N2H4(g)+H2(g)

2KClO3(s)→2KCl(s)+3O2(g)

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Answer #1

For a reaction to be spontaneous must be negative, in this light the second reaction with a negative is spontaneous.

For the first reaction, a positive value of indicate the reaction is nonspontaneous. is positive and is negative and hence the reaction is nonspontaneous at all temperature.

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