Question

A flask weights 46.8 g when it is empty and
121.6 g when filled with water. When the
same flask is filled with another liquid, the
mass is 91.2 g. What is the density of the
second liquid?

Answer 1

You must first find the volume of the flask. Do that with the water.
121.6 g = mass flask + water
- 46.8 g = mass flask empty
----------
74.8 = mass water.
density of water is 1.00 g/mL; therefore,
m = volume x density
74.8 = volume x 1.00 g/mL
volume = 74.8 mL.

Then find mass of the other liquid and use mass = volume x density to solve for density of the other liquid.