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

For each of the following reactions, calculate ΔH∘rxn, ΔS∘rxn, and 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?2CH4(g)→C2H6(g)+H2(g), Calculate ΔS∘rxn at 25 ∘C.

2NH3(g)→N2H4(g)+H2(g) Calculate ΔS∘rxn at 25 ∘C.

N2(g)+O2(g)→2NO(g) Calculate ΔS∘rxn at 25 ∘C.

2KClO3(s)→2KCl(s)+3O2(g) Calculate ΔS∘rxn at 25 ∘C.

Solutions

Expert Solution

2KClO3(s) ----> 2KCl(s) +3O2(g)
∆H = products enthalpy-reactants enthalpy
   = 2*-436.7-2*-397.7
   =-873.4 +795.4 = -78Kj
∆S = proucts entropy - reactants entropy
   = 2*82.6 +3*205-2*143.1
   = 165.2+615-286.2 = 494j/mole-K
∆G = ∆H -T∆S
   = -78 -298*0.494
   = -195.212Kj/mole
∆S> o reaction is spontaneous
lowered than the 25C0

queen_honey_blossom answered 2 years ago
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