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Approximately how long should it take 7.8 kg of ice at 0∘C to melt when it...

Approximately how long should it take 7.8 kg of ice at 0∘C to melt when it is placed in a carefully sealed Styrofoam ice chest of dimensions 25 cm × 35 cm × 55 cm whose walls are 1.5 cm thick? Assume that the conductivity of Styrofoam is double that of air and that the outside temperature is 28 ∘C.

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