2) ??? 4) ??? For which process is Delta S negative? In which of the following r

Question

2) ??? 4) ??? For which process is Delta S negative? In which of the following reactions is Delta S degree likely to be greater than 0? A mixture of hydrogen and chlorine gas will not react until exposed to ultraviolet light. The reaction is H_2 (g)G +9 Cl_2 (g)G rightarrow 2HCl (g) Delta G degree = -45.5 kJ, Delta H degree = 44 kJ, and Delta S degree = -5 J/K The observed behavior of these chemicals is best described as: Delta S degree is negative for HF (aq) H^+ (aq) + F^- (aq). Why? The heat of vaporization for three moles of water at 100 degree C and 1.0 atm is 121.8kJ. The Delta S (in J/K mole H_2 O) for the process H_2O (I) rightarrow H_2 O (g)G at 100 degree C is nearest

Explanation / Answer

2) e) None are positive.

a) Entropy for product (solid) is less that entropy for reactant ( liquid) (delta S <0)

b) Entropy for product (solid) is less that entropy for reactant ( gas) (delta S <0)

c) Reverse of combustion process. Unfavourable reaction (delta S <0)

d) SCl6 does not exist. Reaction unfavourable (delta S <0)

4) b) Water molecule involved with ion hydration contribute to the negative delta S

5) Heat of vaporization for 3 moles of water = 121.8 kJ

=> Heat for 1 mole of water = 121.8 / 3 = 40.6 kJ = 40600 J

Boiling point = 100 degree C = 373 K

=> delta S = 40600 / 373 = 108.85

a) 109

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