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.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

since electrons are negative the answer is neagtaive