When magnesium is heated in air, it reacts with the oxygen gas to form magnesium oxide. If the mass of the magneslum solid increases by 0.681g, what mass of magnesium metal should have reacted? Question 3 of 26 Moving to another question will save this response. Acetylene, C2H2, reacts with oxygen gas to produce carbon dioxide and water. If 40.6 grams of acetylene react with sufficient oxygen, how many grams of CO2 should form