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Once the water is at 100 Â°C, still more energy must be added. This is given by the heat of vaporization, which for water is 2261 kJoules per kilogram. So, in the example, once the 1 kg of water. is at 100 Â°C, this amount of energy must be added to boil it: 1 kg * 2261 KJoules/kilogram = 2261 kJoules.
Rating Newest Oldest. Best Answer: I think you are referring to the British Thermal Unit (BTU), which is the amount of energy required to raise the temperature of one pound of water by one degree fahrenheit (sorry metric system fans).ou will need 4,180 Joules of energy to raise 1 kg of water by 1 degree C. 1 joule = 1 watt of power applied for 1 second.