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Question:

$100 \mathrm{~g}$ of water is heated from $30^{\circ} \mathrm{C}$ to $50^{\circ} \mathrm{C}$ Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is $4184 \mathrm{~J} / \mathrm{kg} / \mathrm{K}$ ) :-

1. $84 \mathrm{~kJ}$

2. $2.1 \mathrm{~kJ}$

3. $4.2 \mathrm{~kJ}$

4. $8.4 \mathrm{~kJ}$

Correct Option: , 4

Solution: