For the dissolution of ammonium nitrate, H = +25.7 kJ/mol and S = +108.7 J/mol K. At room temperature, this process is ________, and H is positive because the lattice energy is ______ the ion-dipole intermolecular forces.

NH4NO3 (s) NH4+ (aq) + NO3 (aq)

a. not spontaneous; greater than

b. not spontaneous; less than

c. not spontaneous; equal to

d. spontaneous; greater than

e. spontaneous; less than

f. spontaneous; equal to