At 25°C, 50 g of iron reacts with HCl to form FeCl?. 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 mol?¹ K?¹. Assume hydrogen is an ideal gas]
[Atomic mass of Fe is 55.85u]
At 25°C, 50 g of iron reacts with HCl to form FeCl?. 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 mol?¹ K?¹. Assume hydrogen is an ideal gas]
[Atomic mass of Fe is 55.85u]
Asked by Shiksha User
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1 Answer
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The reaction is Fe (s) + 2HCl (aq) → FeCl? (aq) + H? (g). 50 g of Fe corresponds to 0.89 moles, which produces 0.89 moles of H? (g). The work done by the gas is calculated using W = -Δn_gasRT. The work done by the gas is the positive value, 2218 J.
Answer: 2218 J
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