You always balance the equation first, which is done.
Set up a proportion: the answer comes out of the balanced equation.
6 mols O2:4 mols CO2:: x : 0.3020 mols CO2
6/4 = x / 0.3020 You could reduce this, but why bother. Calculators to the rescue.
Cross multiply
0.3020 *6 = 4*x
1.812 = 4x Divide by 4
1.812/4 = x
x = 0.4530 to 4 places.
D <<<< answer