Copper melts at 1083°C. Droplets of liquid Cu had been supercooled to 847°C before isothermal solidification occurred. 1. Calculate the enthalpy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 2. Calculate entropy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 3. Calculate the entropy change of the surroundings associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 4. Calculate the total entropy change (system and surrounding) for isothermal solidification of supercooled copper at 847°C. Comment on the results. At 1083°C, AHL-s = -12,958- L→S Cp (Liquid Cu) = 31.35 mole J mole.K Cp (Solid Cu) = 22.61 + 6.27 × 10-³T ) J mole.K

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Copper melts at 1083°C. Droplets of liquid Cu had been supercooled to 847°C before isothermal
solidification occurred.
1. Calculate the enthalpy change of the system associated with the isothermal solidification
of 1 mole of supercooled copper at 847°C.
2. Calculate entropy change of the system associated with the isothermal solidification of 1
mole of supercooled copper at 847°C.
3. Calculate the entropy change of the surroundings associated with the isothermal
solidification of 1 mole of supercooled copper at 847°C.
4. Calculate the total entropy change (system and surrounding) for isothermal solidification
of supercooled copper at 847°C. Comment on the results.
At 1083°C, AHL-s = -12,958-
L→S
Cp (Liquid Cu)
= 31.35
mole
J
mole.K
Cp (Solid Cu) = 22.61 + 6.27 × 10-³T
)
J
mole.K
Transcribed Image Text:Copper melts at 1083°C. Droplets of liquid Cu had been supercooled to 847°C before isothermal solidification occurred. 1. Calculate the enthalpy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 2. Calculate entropy change of the system associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 3. Calculate the entropy change of the surroundings associated with the isothermal solidification of 1 mole of supercooled copper at 847°C. 4. Calculate the total entropy change (system and surrounding) for isothermal solidification of supercooled copper at 847°C. Comment on the results. At 1083°C, AHL-s = -12,958- L→S Cp (Liquid Cu) = 31.35 mole J mole.K Cp (Solid Cu) = 22.61 + 6.27 × 10-³T ) J mole.K
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for 1 and 2, why is it in deg C and not kelvin (K)?

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