Question: A hot iron having specific heat (0.5 mathrm{~kJ} / mathrm{kg} mathrm{K}), mass (30 mathrm{~kg}) and temperature (500^{circ} mathrm{C}) is dropped into (200 mathrm{~kg}) of oil

A hot iron having specific heat $0.5 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$, mass $30 \mathrm{~kg}$ and temperature $500^{\circ} \mathrm{C}$ is dropped into $200 \mathrm{~kg}$ of oil of specific heat $2.5 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$. Calculate change in entropy of iron, oil and composite system.

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