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200 g water is heated from 400C to 600C. Ignoring the slight expansion of water, the change in its internal energy is close to (Given specific heat of water=4184 J/kg/K) :

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Since expansion is ignored, work done is zero and hence by first law of thermodynamics, internal energy change equals heat supplied.

ΔU=Q=0.2(4184)(20) J=16.7 kJ


Hence, the answer is 16.7 kJ