posted by Sigurd on .
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?
You don't have units for most of the numbers in the problem.