A flask with a tap has a volume of 250 cm3. When full of air, the flask has a mass of 42.65 g. The flask is connected to a vacuum pump, the air is pumped out and then the tap is closed. The flask now has a mass of 42.33 g. Calculate:
the mass of the air in the flask before connecting to the vacuum pump,
the density of the air in the flask.
169 exam-style questions on CIE IGCSE Physics Density, covering Density. Each one has a worked solution and a mark scheme showing where the marks go.