Question

There is one typical problem in the chapter gaseous state where a cylinder filled with He gas at some pressure is used for filling balloons of a fixed volume . They ask us to find how many balloons are filled completely .

In the solution to this problem , they consider that when equilibrium pressure is attained , no more He gas will flow out .
Could you please explain me what exactly is going on in this question and the logic behind solving the problem .

Answer 1

@aaronq Please help me out :)

Answer 2

if you've got a container "full" of He gas, maybe at a pressure of 100atm, you can use it to fill lots of balloons, but the air OUTSIDE the cylinder is at a "normal" pressure of 1atm. The He atoms coming out of the cylinder can only push against the atmosphere when the pressure inside the cylinder is larger than the pressure outside. Once the pressure inside the cylinder drops to equal the atmospheric pressure, there is no more "push" from the cylinder, so even though there are gas molecules left inside the cylinder, no more balloons can be filled

Answer 3

Thanks a ton ! :)