Question

A flask containing 9.20 mL of a liquid weighs 184.0 g with the liquid in the flask and 176.3 g when empty. Calculate the density of the liquid in g/ mL to the correct number of significant digits.

Answer 1

Density is the ratio between the mass of a material and its volume (d = m/V) at a given temperature and pressure.

So first we need to find the mass of the material. We can do it calculating the mass of the flask with the liquid minus the mass of the flask without the liquid.

mass of the flask with the liquid = 184.0 g

mass of the flask without the liquid = 176.3 g

mass of the material = 184.0 - 176.3 = 7.7 g

Now we use the following equation: d = m/V

where:

d = density

m = mass = 7.7 g

V = 9.20 mL

d = 7.7/9.20

d = 0.84 g/mL

Answer: d = 0.84 g/mL