If a reaction is exothermic and is accompanies decrease in entropy of the system

Question

If a reaction is exothermic and is accompanies decrease in entropy of the system, then the reaction is spontaneous at low temperatures only. spontaneous at high temperatures only, spontaneous at all temperatures. nonspontaneous at all temperatures. What is the Gibbs Free Energy change for the reaction C_3H_8(8) + 50_2(8) rightarrow 3C0_2(8) + 4H_2O(1) -2111 kj +2 -108, 932 kj 31 For which should delta H^degree and delta G^degree be about 2NO_2(8) rightarrow N_2O_4(g) 2H_2(g) + O_2(g) rightarrow 2H_2O(g) 2Al(s) + Fe_2O_3(s) rightarrow 2Fe(s) + Al_2O3(s) 2Na(s)+ 2H_2O(l) rightarrow 2NaOH(ag) + H What is the entropy change for this reaction? C_3H8(g) + 50_2(g) rightarrow 3CO_2(g) + 4H_2O(l) -191 J. K^-1 -373 J. K^-1 +373 J K^-1 -191 kJ.K^-1

Explanation / Answer

11)
the reaction is exothermic.
so, H is negative

the entropy is decreasing. so
S is negative

G = H - T*S

both H and S is negative, so G is negative at lower tempreature

the reaction is spontaneous when G is negative

Answer: A

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