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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

• Category:- Chemistry
• Reference No.:- M919030

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