A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How many balloons can you fill if each one has a volume of 1.20 L and a pressure of 1.22 atm at 25 ∘C?

You can fill 212 balloons.

Explanation:

First we calculate the helium moles in the small cylinder, using PV=nRT:

141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K

Then we calculate the number of moles that can fit in a single balloon:

Finally we divide the total number of available moles by the number of moles in a single balloon:

So the answer is that you can fill 212 balloons.