4.34 = 0.391^2 / 0.125 / [SO2]^2

What is the concentration of SO2?

4.34 = 0.391^2 / 0.125 / [SO2]^2

4.34=[(0.391^2)/0.125]*[SO2]^2

4.34*0.125=(0.391^2)*[SO2]^2

[4.34*0.125]/(0.391^2)=[SO2]^2

sqrt*[(4.34*0.125)/(0.391^2)]=[SO2]