Question

Define the followings and state their numerical values in Sl system.
(a) Specific latent heat of fusion of ice
(b) Specific latent heat of vaporization of steam. ​

Answer 1

Answer:

a) 3.36×15^5J/Kg

b) 40.8kJ/mol

Explanation:

a) The amount of heat energy released or absorbed when a solid changes to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion. For the material ice, it is defined as the amount of heat required to change one gram of ice to water at the same 0°C. The value of latent heat of fusion of ice is 3.36×15^5JKg−1 in S.I. unit of system.

b) The specific latent heat of vaporization of the system is the heat energy needed to change one kilogram of the material in its liquid state at its boiling point to one kilogram of the material in its gaseous state. For water, it is defined as the heat energy released when one kilogram of water changes to one kilogram of vapor. It is called the same when the reverse process occurs.

The value of the specific latent heat of fusion of water is 2,260kJKg−1 in the SI unit of the system.

Additional information:

In the cgs unit system, the latent heat of vaporization of water is 40.8kJmol−1. Similarly, the latent heat of fusion of ice in the cgs system is 80calg^-1.

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