On which of the following factors does the amount of energy absorbed by an endothermic reaction depend? Number of reactants
Physical state of the reactant
Sum of the potential energy of the reactants and products
Difference in the potential energy of the reactants and products

Difference in the potential energy of the reactants and products

Explanation:

The products have a lower potential energy than the reactants, and the sign of ΔH is negative. In an endothermic reaction, energy is absorbed. The products have a higher potential energy than the reactants, and the sign of ΔH is positive.

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.