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How much ice (at 0 C) must be added to 1.55 kg of water at 77 C so as to end up with all liquid at 20 C? (ci=2000 J/(kg. C), cw=4186 J/(kg.C), Lf=3.35 x 10^5 J/kg, Lv=2.26 x10^6 J/kg)

Fig: 1