Question

What is meant by specific latent heat of vaporization of water = 2.26MJkg−1​

Answer 1

Answer:

It means that to vaporize 1 kg of water, 2.26 MJ of heat energy is to be supplied on it. (b) A 1.0 kW kettle contains 500g of boiling water. Calculate the time needed to evaporate all the water in the kettle.

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Answer 2

"This means that 2.26 MJ of heat energy is required to vaporize 1 kilogram of water from liquid to vapour state at its boiling point."

• "Latent heat is generally defined as the energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process"
• The examples of latent heat are: The heat of freezing and the heat of vaporization.
• The heat of vaporization is defined as the amount of thermal/heat energy that must be added to change a liquid into a gas.
• For example, suppose that the latent heat of vaporization of water is 540 cal/g.
• This means that 540 calories of heat energy is required to vaporise 1gram of water from liquid to vapour state at its boiling point.

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