What is the value of k for this aqueous reaction at 298 k?

Answer : The complete question is attached in answer.

The value of K will be = 2 X

Explanation : We can use the formula as;

∆G = -RT ln K

on rearranging we get, K = 

Therefore, we get,

∆G/RT = (26.81 kJ/mol ) / (0.008314 kJ/mol-K) X (298K) = 10.82

So, K =

Therefore, K = 2 X 

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).