Does the number of moles of reaction products increase, decrease or remain same when the following equilibria is subjected to a decrease in pressure by increasing the volume?
`3Fe(s) +4H_2O(g) iff Fe_3O_4(s)+4H_2(g)`

Explanation

In this reaction , there is no change in the number of moles of gaseous reactants and products . So pressure will not have any effect on the equilibrium.i.e., number of moles of the products will remain the same .