No. of moles of Rn = 0.220 moles
No. of moles of O2 = 0.350 moles
No. of moles of Ar = 0.640 moles
Total no. of moles = 1.21 moles
Mole fraction of O2 , xO2 = 0.350moles / 1.21 moles = 0.289
Total pressure = 1.65 atm
Partial Pressure of O2 = Mole fraction of O2* Total Pressure
= 0.289 * 1.65 atm
= 0.47 atm
What do you mean by moles?
A mole is simply a unit of measurement. In fact, it's one of the seven base units in the International System of Units (SI). Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too. So, scientists invented the mole to bridge the gap between very small and very large numbers.
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