Estimate the change in entropy if (5 mathrm{~kg}) of water at (350 mathrm{~K}) is mixed adiabatically with

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Estimate the change in entropy if \(5 \mathrm{~kg}\) of water at \(350 \mathrm{~K}\) is mixed adiabatically with \(20 \mathrm{~kg}\) of water at \(250 \mathrm{~K}\). Assume the specific heat of water is \(4.2 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\).

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