For which of the following processes would DeltaSdegree be expected to be most p

Question

For which of the following processes would DeltaSdegree be expected to be most positive? H_2O(I) rightarrow H_2O(s) NH_3(g) + HCI(g) rightarrow NH_4CI(s) O_2(g) + 2H_2(g) rightarrow 2H_2O(g) N_2O_4(g) rightarrow 2NO_2(g) 2NH_4NO_3(s) rightarrow 2N_2(g) + O_2(g) + 4H_2O(g) Using the standard entropy values: H_2(g), Sdegree = + 130.6 J mol^minus1 K^minus1 I_2(s), Sdegree = + 116.12 J mol^minus1K^minus1 HI(g), Sdegree = +206.5 J mol^minus1 K^minus1 Calculate the standard entropy change, DeltaSdegree, for the reaction: H_2(g) + I_2(g) rightarrow 2 HI(g) minus40.8 J +40.8 J minus166.3 J +166.3 J 121J For the reaction: A(g) + 2B(g) rightarrow 4C(g), DeltaGdegree = 77.8 kJ. If the reaction mixture consists of 2.0 atm, 4.0 atm B, and 2.5 atm C at 298 K, calculate the DeltaG for this reaction mixture at 298 K. (R=8.314 J/molK). 78.3 kJ 7.89 kJ minus7.89 kJ minus34.2 kJ 34.2 kJ

Explanation / Answer

5.

the "most positive" is that with the greatest change in chaos

so; choose change of phases, and high mol of gas content

choose E

since 2 mol of solid --> 7 mol of gases

6.

Srxn = Sprod - Sreact = 2*206.5 - (130.6 + 116.12) = 166.28 J/K

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