Question #1445a

1 Answer
Gaurang B.
Feb 10, 2016

Spontaneity depends on the value of Gibbs' Free Energy Change .

Explanation:

Gibbs' Free Energy Change is given by DeltaG =DeltaH - TDeltaS where DeltaH is the change in Enthalpy associated with the reaction ,T is the temperature at which given reaction takes place and DeltaS is the change in Entropy for the given reaction.

If the value of DeltaG is negative,the reaction is said to be spontaneous ,if it is positive,the reaction is said to be non-spontaneous.

For the given reaction of conversion of liquid form water to solid form ice,the value of DeltaS would be negative and thus -TDeltaS would be positive.For the spontaneity of the reaction,the enthalpy change DeltaH must be negative and its magnitude would be greater than magnitude of TDeltaS.

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