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19.7 kJ
none
The needed energy at 100 oC is 48751 MJ.
No heat (energy) is required to freeze water (from liquid to solid). Freezing RELEASES energy (heat), as it is an exothermic event. If you want to know how much energy is release, you need to know the heat of fusion for water, and then multiply that by the mass of water being frozen.
A Calorie is the amount of energy required to raise 1cm^3 of water. One cm^2 of water is a two-dimensional object so it technically does not exist.
7.9
how much heat is required to convert 0,3kg of ice at 0c to water at the same tempture
19.7 kJ
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80 cal/gram of heat is required to be extracted from water at 0 degree temp. to convert into ice at 0 degree temp.
The needed energy at 100 oC is 48751 MJ.
No heat (energy) is required to freeze water (from liquid to solid). Freezing RELEASES energy (heat), as it is an exothermic event. If you want to know how much energy is release, you need to know the heat of fusion for water, and then multiply that by the mass of water being frozen.
1 and a half times
the required energy is... 55.5 multiply by 286 = 15873 K.J....
8.25
No energy is gained. On the contrary, energy is required to make ice melt.
The same amount of energy that is required to change it from a solid to a liquid. About 334.0 kJ/kg.