How much heat energy is released when 5.0g water at 42∘C changes into ice at 0∘C? Take specific heat capacity of water = 4.2Jg−1, specific latent heat of fusion of ice = 336Jg−1 :
A
21J
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B
4200J
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C
42J
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D
2562J
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Solution
The correct option is D2562J Heat released Q=mL+mc(42−0)