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A closed box is filled with dry ice at a temperature of

-91.3 oC, while the outside temperature is 20.0 oC. The box is cubical, measuring 0.321 m on a side, and the thickness of the walls is 2.99 × 10-2 m. In one day, 3.13 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.

Please put answer in: J/(s*m*C degrees)

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