A balloon is filled with helium at 0'C and at 1 atm. The mass of the balloon is 50 grams and it contains 15 moles of helium.
What is the volume of the balloon?
molecular weight given for He is 4.0

Question

A balloon is filled with helium at 0'C and at 1 atm. The mass of the balloon is 50 grams and it contains 15 moles of helium.
What is the volume of the balloon?
molecular weight given for He is 4.0

anonymous · Answer

Molar volume of an ideal gas at 0'C and 1 atm pressure is 22.4 dm3

Therefore, assuming ideality, volume of balloon containing 15 moles of He at 0'C and 1 atm is 15 x 22.4
=336 dm3

I _think_ you don't need the mass of the balloon, or the mol wt of He. But don't hold me to that.

anonymous · Answer

Use the ideal gas equation:$$PV=nRT$$Solve for the volume.