What must be true for a substance to dissolve in water? A. The free energy change of dissolving must be positive.
B. The enthalpy and entropy terms must combine for a favored
reaction.
C. The entropy term must be positive.
D. The energy required to break bonds apart must be greater than the
energy released from the substance reacting with the solvent.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )