#7. A vessel whose walls are thermally insulated contains 2.70 kg of water and 0.460 kg of ice, all at a temperature of 0.0 °C. The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted into the water. How many grams of steam must condense inside the vessel (also at atmospheric pressure) to raise the temperature of the system to 27.0 °C? Neglect the heat transferred to the container.