Study the scenario.

A box is initially at the top of a slide, storing 80 J of gravitational energy. The isolated system includes the box, slide and earth.

As the box slides down the frictionless slide, what happens to the total energy of the system?

The isolated system stores slightly less than 80 J of total energy, and it is converted to a different form of energy
The isolated system stores 80 J of total energy, but it is converted to a different form of energy.
The total energy of the isolated system decreases to 0 once the box reaches the bottom of the slide.
The total energy of the system increases to more than 80 J of energy as it gains other forms of energy

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.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.