Question

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

Answer 1

`31 g`

Explanation:

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

- Usually, density will have units of `g/(mL)` when dealing with a liquid or units of `g/(cm^3)` when dealing with a solid.

• The mass has units of grams, `g`.

• The volume will have units of `mL` or `cm^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"`

`color(purple)("Density")` `xx` `color(purple)("Volume = Mass")`

`(1.25 g)/cancel"mL"xx25cancel"mL"`

Thus, the liquid has a mass of 31g.