100 g of water is heated from 30^@C to 5...

100 g of water is heated from `30^@C` to `50^@C`. Ignoring the slight expansion of the water, the change in its internal energy is : (specific heat of water is `4184 J kg^(-1) K^(-1)` )

4.2 kJ

8.4 kJ

84 kJ

2.1kJ

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