Q.

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]

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answer is 2218.

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Detailed Solution

T=298K,R=8.314JmolK→ Chemical reaction isFe+2HCl→FeCl2+H2(g)50g P=1bar=5055.85mol→ Work done for 1 mol gas=−Pext×ΔV=ΔngRT=−1×8.314×298J→ Work done for 5055.85mol of gas=−8.314×298×5055.85J=−2218.059J=−2218J
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