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At 25°C,50g of iron reacts with HCl 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=8.314  Jmol−K−Assume , hydrogen is an ideal gas] [Atomic mass of fe 55.85 u]

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answer is -2218 .

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Detailed Solution

Fe+2HCℓ→FeCℓ2+H21mol 1mol  Wexpanion =−ΔnRT=−5055.85×8.314×298=−2218J
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At 25°C,50g of iron reacts with HCl 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=8.314  Jmol−K−Assume , hydrogen is an ideal gas] [Atomic mass of fe 55.85 u]