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A Styrofoam box has a surface area of 0.88 m² and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 27°C. If it takes 7.4 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam. W/m·K

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