A Substance Has a Melting Point of 20°C and a Heat

question 1

Multiple Choice

A substance has a melting point of 20°C and a heat of fusion of .The boiling point is and the heat of vaporization is at a pressure of 1.0 atm.The specific heats for the solid,liquid,and gaseous phases are 600 J/(kg • K) ,1000 J/(kg • K) ,and 400 J/(kg • K) ,respectively.The quantity of heat required to raise the temperature of of the substance from to at a pressure of 1.0 atm,is closest to

• A) 620 kJ.
• B) 470 kJ.
• C) 560 kJ.
• D) 210 kJ.
• E) 770 kJ.

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