An experiment measures the temperature of a 800g substance while steadily supply

Question

An experiment measures the temperature of a 800g substance while steadily supplying heat to it. The figure shows the results of the experiment.

Part A. What is the specific heat of the solid phase?

Part B. What is the specific heat of the liquid phase?

Part C. What is the melting temperature?

Part D. What is the boiling temperature?

Part E. What is the heat of fusion?

Part F. What is the heat of vaporization?

An experiment measures the temperature of a 800g substance while steadily supplying heat to it. The figure shows the results of the experiment. What is the specific heat of the solid phase? What is the specific heat of the liquid phase? What is the melting temperature? What is the boiling temperature? What is the heat of fusion? What is the heat of vaporization?

Explanation / Answer

A. Sp. heat of solid phase = 20/(0.8*20) = 1.25 kJ/kg-K

B. Sp. heat of liq. phase = (120-40)/(0.8*60) = 1.67 kJ/kg-K

C. Melting temp = -20degC

D. Boiling temp = 40degC

E. Heat of fusion = (40-20)/0.8 = 25 kJ/kg

F. Heat of vaporization = (180-120)/0.8 = 75 kJ/kg

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