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Question

At 25C,50 g 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=8.14 J mol1 K1.
Assume, hydrogen is an ideal gas]
[Atomic mass of Fe is 55.85 u]

A
2218
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B
2218.00
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C
2218.0
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Solution

Fe+2HClFeCl2+H2(g)
50 g
Moles of Fe=5055.85mol = Moles of H2
Wirrev=Pext.ΔV
=- moles of H2×RT
=5055.85×8.314×298
=2218.05 J
Nearest integer =2218

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