Discuss the following: (a) entropy and...

Discuss the following:
(a) entropy and (b) entropy change.

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For which one of the following reactions , the entropy changes is positive ?

`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)`

`Na^(+)(g)+CI^(-)(g)toNaCI(s)`

`NaCI(l)toNaCI(s)`

`H_(2)O(l)toH_(2)O_(g)`

When a liquid evaporates, which is true about the signs of the enthalpy and entropy changes?

`{:(Delta H,Delta S),(+,-):}`

`{:(Delta H,Delta S),(+,+):}`

`{:(Delta H,Delta S),(-,-):}`

`{:(Delta H,Delta S),(-,+):}`

For a sample of perfect gas when its pressure is changed isothermally from p _(i) to p _(f), the entropy change is given by

`Delta S = nR ln ((p _(f))/(P _(i)))`

`Delta S = nR ln ((p _(i))/(P _(f)))`

`Delta S = nRT ln ((p _(f))/(P _(i)))`

`Delta S = nRT ln ((p _(i))/(P _(f)))`