Question

a flask has volume of 200 cm3. when full of air the flask has mass of 30.98g the flask is connected to a vaccum pump the air is pumped out and tap is closed the flask has now mass og 30.72g

calculate
a) the mass of air in flask before connecting to vaccum pipe
b) the density of air in flask

Answer 1

1. 30.98g
2. D = M/V =30.98/200 =0.1549