$200\,g$ water is heated from $40\,^oC$ to $60\,^oC.$ Ignoring the slight expansion of water, the change in its internal energy is close to ...... $kJ$ (Given specific heat of water $=4184\,J/kgK$ )
JEE MAIN 2016, Medium
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Volume of water does not change, no work is done on or by the system $(W=0)$
According to first law of thermodynamics
$Q = \Delta U + W$
For Isochoric process $Q = \Delta U$
$\Delta U = \mu cdT = 2 \times 4184 \times 20 = 16.7\,kJ.$
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