I need help on this question: Considering Gibbs-Helmholtz equation for: For NaCl

Question

I need help on this question: Considering Gibbs-Helmholtz equation for:
For NaCl (s)-> Na+ +  Cl-     G= -  H= + (Here I said S= + at high T) NaNO3 (s) -> Na+ + NO3   G= - H= +    (Here Isaid S= + at high T) NaCH3COO-> Na+ + CH3COO-  G= - H= - (Here I said S=+ at all T) Perdict sing for S, does the sign for entropy changeseems to make sence? explain. ( I guess my teacher also wants me to explain it in terms ofenthropy) I need help on this question: Considering Gibbs-Helmholtz equation for:
For NaCl (s)-> Na+ +  Cl-     G= -  H= + (Here I said S= + at high T) NaNO3 (s) -> Na+ + NO3   G= - H= +    (Here Isaid S= + at high T) NaCH3COO-> Na+ + CH3COO-  G= - H= - (Here I said S=+ at all T) Perdict sing for S, does the sign for entropy changeseems to make sence? explain. ( I guess my teacher also wants me to explain it in terms ofenthropy)

Explanation / Answer

We Know that :     For the above reaction :         NaCl (s) ------> Na+ (aq.) + Cl-(aq.)          G= -ve as the reaction is favourable in the forwarddirection          H =  + ve as the dissociationprocess requires energy           S = + ve the measure of randomness or disorderincreases with the change in the state. i.e. from solid to aqueousstate.         NaNO3 (s) ------> Na+ (aq.) + NO3- (aq.)         G = -veas the reaction is favourable in the forward direction          H =  + ve as the dissociationprocess requires energy           S = + ve the measure of randomness or disorderincreases with the change in the state. i.e. from solid to aqueousstate.          H =  + ve as the dissociationprocess requires energy           S = + ve the measure of randomness or disorderincreases with the change in the state. i.e. from solid to aqueousstate.           CH3COONa --------> CH3COO- (aq.) + Na+ (aq.)         G = -veas the reaction is favourable in the forward direction          H =  - ve as the dissociationprocess liberates energy           S = + ve the measure of randomness or disorderincreases with the change in the state. i.e. from solid to aqueousstate. at all temperatures.         The measure ofentropy is also an important process to identify the favourablecondition for the spontaneous reaction    the positive value of entropy indicates thereaction is favourable generally entropy is dependent on hightemperature.         In common with theincrease in temperature entropy of the system increases.          H =  - ve as the dissociationprocess liberates energy           S = + ve the measure of randomness or disorderincreases with the change in the state. i.e. from solid to aqueousstate. at all temperatures.         The measure ofentropy is also an important process to identify the favourablecondition for the spontaneous reaction    the positive value of entropy indicates thereaction is favourable generally entropy is dependent on hightemperature.         In common with theincrease in temperature entropy of the system increases.               

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