If all the molecules are in the gas phase, what is the change in the number of moles of gas in the equation

Wow that a lot of text for my tiny so i no wanna answer

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.

Mars contains iron oxide in its crust

The answer would be 25.3