How much steam must be mixed with water

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How much steam must be mixedwith 300.g of water in 155 g aluminum calorimeter initially at 20.0degrees c to obtain a final temp of 80.0 degrees c ?  CAl = 0.215 cal/gC° CW = 1.00 cal/gC° Lf= 79.6cal/g Lv = 540 cal/g

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