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A gas present in a cylinder fitted with a frictionless piston expands against a constant pressure of 1 atm from a volume of 2 litre to a volume of 6 litre. In doing so, it absorbs 800 J heat from surroundings. Determine increase in internal energy of process. |
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Answer» Since,work is done against constant pressure and thus, irreversible. Given, ΔV = (6 – 2) = 4 litre; P = 1 atm ∴ W = – 1 × 4 litre-atm = – 4 × 1.01325 × 102 J = 405.3 J Now from first law of thermodynamics q = ΔU – W 800 = ΔU + 405.3 ∴ ΔU = 394.7 Joule |
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