A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. This sample contains how many moles of oxygen atoms?

10.28 mol

Explanation:

S + 2O = SO2

(atm x L) : (0.0821 x K)

(3.45 x 45.6) : (0.0821 x 373)

=5.13726

Then round it to significant figures

=5.14

5.14 mol SO2 x (2 mol O : 1 mol SO2)

=10.28 mol O