1) The heat of vaporization of water at 100.0°C is 2,256 kJ/kg. What is the heat

Question

1) The heat of vaporization of water at 100.0°C is 2,256 kJ/kg. What is the heat of vaporization of water in cal/gm?
A) 365.3
B) 418.6
C) 497.2
D) 538.9
E) 684.1

2) A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0°C and the other temperature is 25.0°C. The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2. If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal?
A) 69.2 W/m·°C
B) 58.2 W/m·°C
C) 50.4 W/m·°C
D) 46.3 W/m·°C
E) 44.2 W/m·°C

Explanation / Answer

1.D 1cal=4.18joules 1kg=1000gm 2.A

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