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Find the work done when 2 moles of hydrogen gas expand isothermally from 15 to 50 litres against a constant pressure of 1 atm at $25^{0} C .$

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848.2 cal

848.2 Kcal

84.82 cal

84.82 Kcal

answer is A.

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Detailed Solution

$W = - P (V_{2} - V_{1}) = - 1 \times 35 = - 35 L - atm = - 35 \times 101.3 J = - 3545.5 J = - \frac{3545.5}{4.18} = 848.2 cal$

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