An electric heater put in some water raises the temperature of the water from 40°C to 100°C in 6 minutes. After another 25 minutes, it's noticed that half the water has boiled away. Neglecting heat losses to the surrounding, calculate shc of vaporisation?
1 Answer
Feb 26, 2018
Let the rate of heat transfer from heater to water be
Now heat energy required to raise the temperature of
, Where
Now the amount of heat given by the heater in 6min
Again the amount of heat taken by water at
This amount of heat is supplied by the heater in 25min
So
Dividing (2) by (1) we get