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100 \mathrm{~g} water is Heated from 20^{\circ} \mathrm{C} to 40^{\circ} \mathrm{C}. Ignoring the slight expansion of water; the change in its internal energy is core to
[ Given specific Heat of water = 4184 \mathrm{~J/kg/K}]
 

Option: 1

168.7 \mathrm{~kJ}


Option: 2

24.78 \mathrm{~kJ}


Option: 3

4.2 \mathrm{KJ}


Option: 4

83.68 \mathrm{KJ}


Answers (1)

best_answer

The volume of water docs nat change no work io done on or by the system (\omega=0)

Acc. Ho first law of thermodynamics

\mathrm{Q=\Delta v+\omega }

For isocharic process \mathrm{Q=\Delta U }

\begin{aligned} \mathrm{\Delta U} & =\mathrm{m c d T} \\ & =\mathrm{\frac{1}{10} \times 4184 \times 2 \phi} \\ & =8368 \mathrm{FJ}=83.68 \mathrm{~kJ} \end{aligned}

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Divya Prakash Singh

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