What happens to the potential energy of the molecules in a reaction? A. The potential energy of the products is equal to that of the
reactants.
B. The reactants only lose potential energy when forming products.
The potential energy of the molecules changes during a reaction.
D. The potential energy of the molecules does not change in a
reaction.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

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