Question: A helium balloon, assumed to be a perfect sphere, has a radius of 24.0 cm. At room temperature (20C), its internal pressure is 1.08 atm.

A helium balloon, assumed to be a perfect sphere, has a radius of 24.0 cm. At room temperature (20°C), its internal pressure is 1.08 atm. Determine the number of moles of helium in the balloon, and the mass of helium needed to inflate the balloon to these values.

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