Conduction of Heat: the Walls of an Ice Chest Are

Multiple Choice

Conduction of heat: The walls of an ice chest are made of 2.00-mm-thick insulation having a thermal conductivity 0.00300 W/m∙K. The total surface area of the ice chest is 1.20 m². If 4.00 kg of ice at 0.00°C are placed in the chest and the temperature of the outside surface of the chest is 20.0°C, how long does it take the ice to melt under steady state conditions? The latent heat of fusion of water is 79.6 cal/g = 334 kJ/kg.

A) 4.22 h
B) 22.1 h
C) 17.6 h
D) 1.33 d
E) 10.3 h