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A 40kg piece of steel (Cp = .5kJ kg^-1 K^-1) at temperature 450C is quenched in 150kg of oil (Cp = 2.5kJ kg^-1 K^-1) at

A 40kg piece of steel (Cp = .5kJ kg^-1 K^-1) at temperature 450C is quenched in 150kg of oil (Cp = 2.5kJ kg^-1 K^-1) at temperature 25C. If there are no heat loses what is the change of entropy of

(a) the steel,

(b) the oil. and

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