Copper melts at 1083°C. Droplets of liquid Cu had been supercooled to 847°C before isothermal solidification occurred. (a) Calculate entropy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. (b) Calculate the enthalpy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. (c) Calculate the entropy change of the surroundings associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. (d) Calculate the total entropy change (system and surrounding) for isothermal solidification of supercooled copper at 847°C. Comment on the results. Data At 1083°C, AHL-s = −12958 J/mole Cp (Liquid Cu) = 31.35 J mole.K 3 Cp (Solid Cu) = (22.61 + 6.27 × 10-³T) mole.K

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