Physics
How much heat energy is released when 5.0 g of water at 20° C changes into ice at 0° C? Take specific heat capacity of water = 4.2 J g-1 K-1, specific latent heat of fusion of ice = 336 J g-1.
Calorimetry
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Answer
Given,
Mass (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
(i) Heat energy released when water lowers it's temperature from 20° C to 0° C
= m x c x change in temperature
Substituting the values in the formula we get,
(ii) Heat energy released when water at 0° C changes into ice at 0° C = m x L
Substituting the values in the formula we get,
From relation,
Total heat released = 2100 J
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