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What mass (in grams) of steam at 100°C must be mixed with 277 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 28.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent heat of vaporization is 2256 kJ/kg.

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