http://www.go2itnetwork.com/degree-melt/
How much heat is needed to melt and vaporize a 1-kg ice at -2 degree Celsius to steam at 100 degree Celsius ?
explain 
1 kg = 1000 gm
Heat reqd. to heat 1000 gm of ice from – 2 to 0 degree C = 1000 * (0.5) * 2 = 1000 cal.
Heat required to melt 1000 gm of ice at 0 degree C = 1000 * 80 = 80000 cal
Heat required to raise the temperature of water from 0 to 100 degrees C = 1000 * 100 = 100000 cal
Heat reqd. to vaporize 1000 gm of water to steam at 100 degree C = 1000 * 540 = 540000 cal
Total heat reqd. to melt and vaporize 1 kg ice at – 2 degrees C to steam at 100 degrees C
= 1000 + 80000 + 10000 + 540000 cal
= 721000 cal.
110 Degrees
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