What is entropy change?Predict the sign of entropy chsnge in each of the following giving reasons for your predictions :
(i) `H_(2) (at 25^(@)C, 1 atm) to H_(2)(at 25^(@)C` and 10 atm))
(ii) `H_(2)O(at 25^(@)C, 1 atm ) to H_(2)O(at 50^(@)C` and 1 atm))
(iii) `2NH_(4)NO_(3)(s) to 2N_(2)(g) + 4H_(2)O(g) + O_(2)(g)`

Explanation

(i)`DeltaS = -ve` entropy decreases with increase in pressure
(ii) `DeltaS = + ve` entropy increases with increase in temperature.
`DeltaS = + ve` gases are produced.