Answer
Please see the work below.
Work Step by Step
We know that
$Volume=\frac{mass}{density}=\frac{5.3}{0.789}=6.717cm^3$
We can find the density as
$Density=\frac{mass}{volume}=\frac{15.8}{6.17}=2.4\frac{g}{cm^3}$
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