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A closed box is filled with dry ice at a temperature of -80.4 oC, while the outside temperature is 20.8 oC. The box is cubical, measuring 0.359 m on a side, and the thickness of the walls is 3.91 × 10-2 m. In one day, 3.85 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.

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