# Question #15270

##### 1 Answer

#### Answer:

To solve this problem you need to use the formula for density.

#### Explanation:

Density is defined as mass per unit of volume.

Mathematically, the relationship between density, mass, and volume can be written like this

In your case, you know that ether has a density of **0.71 g/mL**. This means that *every* mL of ether has a mass of **0.71 g**. Likewise, you can say that *every* 0.71 g of ehter occupy a volume of **1 mL**.

Thus, the **250-g** sample will have a volume of

Rounded to two sig figs, the answer will be

Now for the mass of the urine sample. The density of urine in a patient with kidney malfunction is known to be **1.001 g/mL**.

This means that *every* mL of urine has a mass of 1.001 g. Since you have 20 mL in your sample, you'd get

Rounded to one sig fig, the number of sig figs you gave for the volume of the sample, the answer will be