Answer
$0.5kg=500 g$
Work Step by Step
First, we have to change $mL$ to $L$
$$500 \ mL=\frac{500}{1000} \ L=0.5 L.$$
Since $1~L$ of water weighs $1~kg=1000~g$, the mass of 500 $mL$ of water is $0.5kg=500~g$
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