Question

How much heat is required to take boiling point from 150 degree water to 30 degree centigrade​

Answer 1

Answer:

A: I first take care to look up the specific heat of water in its three phases. Here is the result:

“The specific heat capacity, or the amount of heat needed to raise the temperature of a specific substance in a specific form one degree Celsius, for water is 4.187 kJ/kgK, for ice 2.108 kJ/kgK, and for water vapor (steam) 1.996 kJ/kgK.”

The questioner asks about two phases: from 30 - 100 degC, and from 100 - 150 deg C

Hence we need 4.187 kJ x 70 plus 1.996 kJ x 50 plus the biggest contribution: latent heat of vaporization of water. I see that “ The heat of vaporization of water is about 2,260 kJ/kg”.

The sum of these contributions is 293.09 + 99.8 + 2260 = 2652.89 kJ per kg.

Explanation:

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