**Unformatted text preview: **The heat required to change the temperature of 150 g of water from 0 ϒ C to 50 ϒ C is given by The total heat that needs to be added to the system is therefore equal to 81.5 kJ. This heat must be supplied by the steam. Heat will be released when the steam is transformed into liquid, The heat of transformation for this process is 2260 kJ/kg. Suppose the mass of the steam is m. The total heat released in the conversion of steam into water is given by The heat released when the steam cools down from 100 ϒ C to 50 ϒ C is given by The total heat released by the cooling of the steam is therefore equal to 2470 m kJ. The total heat required is 81.5 kJ, and we therefore conclude that the mass of the steam must be equal to 33 g....

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