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A Styrofoam bucket of negligible mass contains 1.55 kg of water and 0.435 kg of ice....

A Styrofoam bucket of negligible mass contains 1.55 kg of water and 0.435 kg of ice. More ice, from a refrigerator at -15.0 ∘C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.772 kg .

Assuming no heat exchange with the surroundings, what mass of ice was added?

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