A mechanical pencil has the density of 1.25g/cm^3 . The volume of the pencil is 15.8cm^3 . What is the mass of the pencil?

* **Formula:** Density = Mass / Volume<br /><br />* **Rearrange the formula to solve for Mass:** Mass = Density * Volume<br /><br />* **Plug in the given values:** Mass = (1.25 g/cm³) * (15.8 cm³)<br /><br />* **Calculate:** Mass = 19.75 g<br /><br />Therefore, the mass of the pencil is $\boxed{19.75}$ grams.<br />