Answer: A helium balloon, assumed to be a perfect sphere,
Chapter , Problem 76(choose chapter or problem)
A helium balloon, assumed to be a perfect sphere, has aradius of 22.0 cm. At room temperature (20C), its internalpressure is 1.06 atm. Determine the number of moles ofhelium in the balloon, and the mass of helium needed toinflate the balloon to these values.
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