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An electric heater immersed in some water raises the temperature of the water from 40°c...

An electric heater immersed in some water raises the temperature of the water from 40°c to 100°c in 6 minutes. After another 25 minutes, it is noticed that half the water has boiled away. Neglecting heat losses to surrounding, calculate the the specific latent heat of vaporization of water?
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