A mixture of 0.225 kg of ice and 1.20 kg of water in a thermally insulating tank has a temperature of 0.0 °C. Waste steam at 100°C exhausted from a cooking pot is conveyed into the tank. Determine the mass of steam that must be delivered in the tank to generate water at 50.0 °C. Assume that the tank absorbs negligible heat and that all processes occur at atmospheric pressure.