Question

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

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

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