Posted by Anonymous on Monday, November 7, 2011 at 1:49pm.
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, Monday, November 7, 2011 at 9:55pm
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, Tuesday, November 8, 2011 at 11:42am
I erred here. 8.3 ppm should be expressed as 8.3E6 mole fraction Rn.
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