A (30 mathrm{~kg}) block of steel casting at (635 mathrm{~K}) is quenched in (135 mathrm{~kg}) oil at
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A \(30 \mathrm{~kg}\) block of steel casting at \(635 \mathrm{~K}\) is quenched in \(135 \mathrm{~kg}\) oil at \(283 \mathrm{~K}\). If there are no heat losses, determine the change in entropy. Assume that the specific heat of steel is \(0.72 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\) and that of oil is \(2.4 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\).
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