A Styrofoam box has a surface area of 0.86 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 23°C. If it takes 8.2 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
W/m·K