Calculate the amount of heat required to convert 15 gram water at hundred degree Celsius to water vapour at the same temperature
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Calculate the amount of heat required to convert 15 grams of ice at 0 degree Celsius, into 15 grams of water at 0 degrees Celsius?
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Martin Williams
Answered Jul 1, 2018 · Author has 452answers and 101.6k answer views
Converting water into ice and back again involves a huge amount of heat compared to other substances.
Some years back, our fridge died on Christmas eve. It was stuffed with food and there would be no chance of getting it replaced or repaired for a couple of weeks. I recalled the precursors of domestic refrigerators - the ice box - and decided to give it a try.
We froze probably about a gallon of water in plastic (tupperware) containers using our freezer, and when solid stuck them in the fridge on the top shelf. I happen to have a thermocouple based thermometer so used that to monitor the temperature inside.
It worked like a charm! Modern ‘fridges are very well insulated, and we found that the gallon or so of frozen water kept the temperature at about 1 C - below the 4 or 5C that fridges usually run at- for about two days!
It occurred to me that were electricity companies ever to bring in load shedding to manage their networks, that ‘fridges designed to deliberately maintain a mass of water as ice as part of their their cooling mechanism might become very saleable!
Being retired I’ve no interest in money-making and can’t be bothered with patenting it, so if anyone fancies giving it a whirl, then good luck to them!
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4 ANSWERS

Martin Williams
Answered Jul 1, 2018 · Author has 452answers and 101.6k answer views
Converting water into ice and back again involves a huge amount of heat compared to other substances.
Some years back, our fridge died on Christmas eve. It was stuffed with food and there would be no chance of getting it replaced or repaired for a couple of weeks. I recalled the precursors of domestic refrigerators - the ice box - and decided to give it a try.
We froze probably about a gallon of water in plastic (tupperware) containers using our freezer, and when solid stuck them in the fridge on the top shelf. I happen to have a thermocouple based thermometer so used that to monitor the temperature inside.
It worked like a charm! Modern ‘fridges are very well insulated, and we found that the gallon or so of frozen water kept the temperature at about 1 C - below the 4 or 5C that fridges usually run at- for about two days!
It occurred to me that were electricity companies ever to bring in load shedding to manage their networks, that ‘fridges designed to deliberately maintain a mass of water as ice as part of their their cooling mechanism might become very saleable!
Being retired I’ve no interest in money-making and can’t be bothered with patenting it, so if anyone fancies giving it a whirl, then good luck to them!
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Answer:
I think it is 8,100cal
Is it correct
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