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ICSE Class 10 Physics 2013 Solved Paper

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Question : 28
Total: 70
How much heat energy is released when 5g of water at 20∘C changes to ice at 0∘C ?
[Specific heat capacity of water =4.2Jg−10 C−1.
Specific latent heat of fusion of ice =336J g−1]
Solution:  
‌ Heat energy ‌‌=mc∆T+mL
‌=5×4.2×(20−0)+5×336
‌=420+1680
‌=2100‌ Joule. ‌
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