Chemistry
posted by Sigurd .
A 1.50 gas sample at 735 and 25.0 contains 5.00 radon220 by volume. Radon220 is an alphaemitter with a halflife of 55.6 .
How many alpha particles are emitted by the gas sample in 4.00 minutes?

You don't have units for most of the numbers in the problem.
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