Water changes into ice at 0C, by giving out heat energy, The heat energy so given out is called (1)specific heat of water (2)latent heat of fusion (3)latent heat of solidification of water (4)latent heat of vaporization

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Q. How much heat energy is released when 5.0 g of water at

20^{0} C

changes to ice at

0^{0} C

? Take specific heat capacity of water equal to 4.2

J g^{- 1} C^{- 1}

, specific latent heat of fusion of ice = 336

J g^{- 1}

10 g of ice at $0^{o} C$ absorbs 5460 J of heat energy to melt and change to water at $50^{o} C$ . Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is 4200 J $k g^{-} 1 K^{- 1}$ .

Q. Latent heat of vaporization of water is more than latent heat of fusion of ice.

a. What is latent heat?

b. Discuss Latent heat of fusion of ice and Latent heat of vaporization of water.

Q. How much energy is required to change

2 K g

of ice at

0^{0} C

into water at

20^{0} C

? (specific latent of heat of fusion of water =

3, 34, 000 J / K g

, specific heat capacity of water =

4200 J {K g}^{- 1} K^{- 1}

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