A half kg bar of iron, initially at 782oC, is removed from an oven and quenched by

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A half kg bar of iron, initially at 782oC, is removed from an oven and quenched by immersing it in a closed tank containing 10 kg of water initially at 21oC. Heat transfer from the tank can be neglected. Determine.
(a) The equilibrium temperature.
(b) And the total entropy change for this process.
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