User:Theonesean/sandbox2

$$ \frac{1.345\,\textrm{g}}{1\,\cancel{\textrm{cm}^3}}\, \frac{0.5\,\cancel{\textrm{L}}}{1}\, \frac{1000\,\cancel{\textrm{cm}^3}}{1\,\cancel{\textrm{L}}}=0.6725\,\textrm{g} ​​​​​​​​​​​​​​​​​​ $$