The sum of heats gained is zero (on has negative heat gained).
Add the heats.
1kg*Lfice+1kg(cwater)(15-0)+M*Lvsteam+M*cwater*(15-100)=0
solve for M
What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 15°C?
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