A sample of air from the basement of a home is found to

Question

contain 8.3 ppm of radon. What is the partial pressure of radon
in the basement if the total pressure is 755 torr?

Answer 1

I assume that is 8.3 ppm v/v; if so I would convert that to percent.
(8.3E-6 L/10^6 L)* 100 = mole percent = about 8.3E-10%. Convert that to a fraction (divide by 100) to give mole fraction Rn_, then
p_Rn = X_RnP_total

Answer 2

I erred here. 8.3 ppm should be expressed as 8.3E-6 mole fraction Rn.