Charle's Law exercises

A gas was placed in a piston at 20oC and occupied a volume of 20ml. The gas was then heated to 100oC and allowed to expand under constant pressure. What is the final volume of the gas.


V1 = 20ml = 0.02L
T 1 = (20 + 273) =293oK
V2 = ?
T 2 = (100 + 273) =373oK
=>0.02/293 = V2/373
=>(0.02/293) X 373 = V2
 =>25.5ml =0.0255L= V2

1) A sample of air at 40oC is placed in a piston, similar to the one shown above, and occupies a volume of 10ml. The sample was heated to 240oC and the piston allowed to expand under atmospheric pressure. What was the final volume of the gas inside the piston?
2) 6 litres of gas has been collected at 20oC. What volume will the gas occupy at 140oC if the pressure remains constant?
3) 0.035 litres of gas has been collected at 0oC. What volume will the gas occupy at 40oC if the pressure remains constant?
4) 400 litres of air is placed in a sealed balloon at 20oC. In order to take off the balloon must expand to a volume of 2,000 litres. What must the temperature of the air inside the balloon be before it can lift off?