Atmosphere, Pressure, & Weather

[zeeberz]

A balloon can be filled with 5.0 L of "He" w/o bursting. The balloon is filled 0.5 L at a pressure of 1 atm. The balloon rises and the pressure gets lower. At what pressure will the balloon burst? I tried a few of the gas laws but I think my answers are incorrect. How do you solve this?

 

[chemisttree]

Solved by employing the correct gas law. Which one(s?) have you examined. Show us your rationale.