How much heat energy is gained when 5kg of water at 20∘C is brought to its boiling point? (Specific heat of water=4.2kJkg−1c−1)
A
1680kJ
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B
1700kJ
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C
1720kJ
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D
1740kJ
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Solution
The correct option is A
1680kJ
Given, Mass of water = 5kg Specific heat of water = 4.2kJkg−1.∘C−1 Rise in temperature of water =100−20=80∘C The formula to calculate specific heat is: Q=mcΔθ Q=50×4.2×103×80 Q=1680×103J=1680kJ