Asked by Sara

The air in a typical La Crosse basement contains 53 atoms of 222Rn per liter. A. If the basement has 950 ft^2 of floor space and is 8.0 feet tall, how many 222Rn atoms are there in the whole basement? B. Assuming a total pressure of 1.00 atm, what is the partial pressure of 222Rn at 19℃?

Could I get some help? I don't know how to do this
Answered by DrBob222
Sara, sam, et al. Why not use the same screen name?

volume room is 950 ft^2 x 8 ft = ? cubic feet. Convert to L.
You have 53 atoms Rn222/L so
53 atoms/L x #L = # Rn222 atoms in the basement.

B.
Convert # atoms Rn to mols Rn and use PV = nRT to solve for P.
Answered by Enrique
DrBob is right and all but i just had a thought as i solved it about converting. I'd recommend converting feet to cm first since 1cm^3=1mL and that's a lot more convenient, easier to remember, and if you're in the middle of a test chances are its not gonna tell you how to convert a cubed foot into liters in the conversion charts. I really wish I had someone just giving me tips like this and that I hadn't had the need to suffer and go through bad experiences to think about these minor details.
Answered by DrBob222
Enrique is correct but just for the record this is how I did it.
7600 ft^3 x (1,728 in^3/ft^3) x (2.54 cm/in)^3 x (1 L/1000 cc) = ?
1,728 and 2.54 and 1000cc to 1L are just three of those conversion factors I memorized back in the days before calculators, computers, and such were in vogue.
Answered by Anonymous
Upon decomposition, one sample of magnesium fluoride produced 1.66 kg of magnesium and 2.57 kg of fluorine. A second sample produced 1.26 kg of magnesium
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