At 25°C, 50 g of iron reacts with HCI to form FeCl2 The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by the gas during this expansion is   J. (Round off to the Nearest Integer)[Given R=8.314dmol−1K−1 Assume, hydrogen is an ideal gas: [Atomic mass off Fe is 55.85 u]