. How much heat energy is released when 5.0 g of water at 20o C


How much heat energy is released when 5.0 g of water at 20C changes into ice at 0C? Take specific heat capacity of water =4.2 J g-1 K-1, specific latent heat of fusion of ice = 336 J g-1.

 

Best Answer

Mass of water m = 5.0 g

Specific heat capacity of water c = 4.2 J g-1 K-1

Specific latent heat of fusion of ice L = 336 J g-1

Amount of heat energy released when 5.0 g of water at 200 C changes into water at 00 C = 5 × 4.2 × 20

= 420 J

Amount of heat energy released when 5.0 g of water at 00 C changes into ice at 00 C = 5 × 336 J

= 1680 J

Total amount of heat released = 1680 J + 420 J

= 2100 J

 

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