Your 300mL cup of coffee is too hot to drink when served at 86.0 ∘C. What...

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Your 300mL cup of coffee is too hot to drink when served at 86.0 ∘C.

What is the mass of an ice cube, taken from a -23.0 ∘C freezer, that will cool your coffee to a pleasant 61.0 ∘?

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