Explain how a chemist would use the difference method in measuring the mass of a liquid

The mass of a liquid can be measured using one of two methods:

Method n°1:
- Measure the mass of the empty container.
- Pour the liquid into the container and measure the new mass.
- The mass of liquid is obtained by subtracting the mass of the container to the total mass.

Method n ° 2 (Easier and faster):
- Place the empty container on the balance.
- Tare the scale (by pressing the tare button). The scale then displays zero.
- Pour the liquid into the container. The mass of liquid is directly displayed.

The answer is c. 320 g