Answer
$13.6\text{ g}\cdot\text{cm}^{-3}$
Work Step by Step
Divide the mass by volume to find the density:
$Density=\frac{mass}{volume}=\frac{20.4\text{ g}}{1.5\text{ cm}^{3}}$
$=13.6\text{ g}\cdot\text{cm}^{-3}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.