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A system undergoing change in state from A to B along path ‘X’ receives 100 J heat and does 40 J work. It returns to state A from B along path ‘Y’ with work input of 30 J. Calculate the heat transfer involved along the path ‘Y’.

A system undergoing change in state from A to B along path ‘X’ receives 100 J heat and does 40 J work. It returns to state A from B along path ‘Y’ with work input of 30 J. Calculate the heat transfer involved along the path ‘Y’. Correct Answer – 90 J

∆UX = AQB – AWB = 100 – 40 = 60 J Heat transfer involved along the ‘Y’ (BQA) = ∆UY + BWA = – ∆UX + BWA = – 60 – 30 = – 90 J.

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