What expression approximates the volume of o2 consumed, measure at stp, when 55 g of al reacts completely with excess o2? 2 al(s) + 3 o2(g) --> 2 al2o3(s)0.5 x 0.67 x 22.42 x 1.5 x 22.40.5 x 1.5 x 22.42 x 0.67 x 22.4