When steam is passed over red hot iron, `H_(2)` gas is produced. In this reaction, the yield of `H_(2)(g)` is found to increase when the partial pressure of steam is increased. Explain.

Explanation

Reaction: `Fe(s)+4H_(2)O(g) hArr Fe_(3)O_(4)(s)+4H_(2)(g)`
A steam is one of the reactants in the above reaction, increasing its partial pressure at equilibrium will shift the equilibrium position to the right. As a result the yield of the product i.e., `H_(2)(g)` will increase.