$100g$ of water is heated from ${30^ \circ }C$ to ${50^ \circ }C$. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is $4184$ $J/kg/K$):
$8.4$ $kJ$
$84$ $kJ$
$2.1$ $kJ$
$4.2$ $kJ$
Solution
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