Question

What is the density of an object that has a mass of 5.8g and a volume of 2.1 mL?

Answer 1

`\boxed {\boxed {\sf 2.8 \ g/mL}}`

Step-by-step explanation:

Density is an object's mass per unit volume. The formula for calculating density is:

`\rho= (m)/(v)`

The mass of the object is 5.8 grams and the volume is 2.1 milliliters.

• m= 5.8 g
• v= 2.1 mL

Substitute the variables into the formula.

`\rho = (5.8 \ g)/(2.1 \ mL)`

Divide.

`\rho = 2.761904762 \ g/mL`

The original values of mass and volume (5.8 and 2.1) have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 7 in the tenth place up to an 8.

`\rho \approx 2.8 \ g/mL`

The density of the object is approximately 2.8 grams per milliliter.