At \( 25^\circ \text{C} \), \( 50 \, \text{g} \) of iron reacts with HCl to form \( \mathrm{FeCl}_2 \). The evolved hydrogen gas expands against a constant pressure of \( 1 \, \text{bar} \). The work done by the gas during this expansion is __________ \( \text{J} \).
(Round off to the Nearest Integer). [Given : \( R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} \). Assume hydrogen is an ideal gas] [Atomic mass of Fe is \( 55.85 \, \text{u} \)]
