# What is the mass of 25 mL of a liquid if its density is 1.25 g/mL?

Aug 18, 2016

$31 g$

#### Explanation:

To calculate the mass of the liquid, we have to use this formula:

- Usually, density will have units of $\frac{g}{m L}$ when dealing with a liquid or units of $\frac{g}{c {m}^{3}}$ when dealing with a solid.

• The mass has units of grams, $g$.

• The volume will have units of $m L$ or $c {m}^{3}$

We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:

densityxxvolume=(mass)/(cancel"volume")xxcancel"volume"

$\textcolor{p u r p \le}{\text{Density}}$$\times$$\textcolor{p u r p \le}{\text{Volume = Mass}}$

$\frac{1.25 g}{\cancel{\text{mL"xx25cancel"mL}}}$

Thus, the liquid has a mass of 31g.