2Mg + O2 ==> 2MgO
You must mean if 40 g magnesium OXIDE are produced and you must be using 24 for the atomic mass Mg and 40 as molar mass MgO. In those circumstances.
mols Mg = 24/24 = 1 mol and that will produce 40 g MgO.
mols O2 consumed = 40g MgO x (1 mol O2/2 mol MgO) = 40 x 1/2 = 20 mols O2.
Then grams O2 = mols x molar mass.
When 24g of Magnesium reacts with oxygen gas the only product is magnesium oxide. If 40g magnesuim is produced how much oxygen was consumed?
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