At 25°C,50g of iron reacts with HCl to form $F e C l_{2}$ .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 : $R = 8.314 J m o l^{-} K^{-}$ 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

$\begin{array}{l} Fe + 2 HC ℓ \to FeC ℓ_{2} + H_{2} \\ 1 mol 1 mol \end{array} W_{expanion} = - ΔnRT = - \frac{50}{55.85} \times 8.314 \times 298 = - 2218 J$

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