Posted by **Sigurd** on Sunday, July 29, 2012 at 8:03pm.

A 1.50- gas sample at 735 and 25.0 contains 5.00 radon-220 by volume. Radon-220 is an alpha-emitter with a half-life of 55.6 .

How many alpha particles are emitted by the gas sample in 4.00 minutes?

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