Posted by Anonymous on .
A sample of air from the basement of a home is found to
contain 8.3 ppm of radon. What is the partial pressure of radon
in the basement if the total pressure is 755 torr?

chemistry 
DrBob222,
I assume that is 8.3 ppm v/v; if so I would convert that to percent.
(8.3E6 L/10^6 L)* 100 = mole percent = about 8.3E10%. Convert that to a fraction (divide by 100) to give mole fraction Rn_, then
p_{Rn} = X_{Rn}P_{total} 
chemistry 
DrBob222,
I erred here. 8.3 ppm should be expressed as 8.3E6 mole fraction Rn.