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find out the Entropy change.

1. From the following Ho and So values predict which of reactions I, II, and III will be spontaneous at 300ºC.

 

H (kJ)

S(J/K)

I

-5.0

-15

II

-10.0

+20

III

-5.0

-30

 A.I

 B.II

 C.III

 D.I and II

 E.II and III

 

2. From the following Ho and So values predict which of reactions I, II, and III would be spontaneous at 25ºC.

 

H (kJ)

S(J/K)

I

+10.5

+30

II

+1.8

-113

III

-126

+84

 

 A.I

 B.II

 C.III

 D.I and II

 E.II and III

 

3. Work out the entropy change (J/mole.K) of the reaction. The molar entropies [S] are given in brackets

after each substance.

2 CuS(s) [66.5] + 3 O2(g) [205.1]" 2 CuO(s) [42.6] + 2 SO2(g) [248.2]

 A.-114.2

 B.-139.1

 C.+33.0

 D.+68.2

 E.+166.7

 

4.. find out the entropy change (J/mole.K) of the reaction. The molar entropies [S] are given in

brackets after each substance.

3 NO2(g) [240.1] + H2O(l) [69.9] " 2 HNO3(aq) [146.4] + NO(g) [210.8]

 A.-286.6

 B.-212.4

 C.-156.3

 D.+47.2

 E. +156.3

 

5.Given Sº = -266.3 and the listed [Sº values] find out Sº for Fe3O4(s).

4 Fe3O4(s) [____] + O2(g) [205.1] " 6 Fe2O3(s) [87.4]

 A.+111.1

 B.+122.4

 C.+134.1

 D.+146.4

 E.+159.6

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