How much heat energy is released when 5 {\g} of water at 20^{\circ} {\C} changes to ice at 0^{\circ} {\C} ? [Specific heat capacity of water =4.2 {\Jg}^{-10} C^{-1}. Specific latent heat of fusion of ice =336 {\J} g^{-1}]

ICSE Class 10 Physics 2013 Solved Paper - Question 28

Question : 28 of 70

Marks: +1, -0

How much heat energy is released when

5 {\g}

of water at

20^{∘} {\C}

changes to ice at

0^{∘} {\C}

?
[Specific heat capacity of water

=4.2 {\Jg}^{-10}

C^{-1}

.
Specific latent heat of fusion of ice

=336 {\J}

g^{-1}]

Solution:

\;\text " Heat energy "\;\;=m c ∆ {\T}+m {\L}

\;=5 × 4.2 ×(20-0)+5 × 336

\;=420+1680

\;=2100 \;\text " Joule. "\;

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