Rhodesnewbygo Rhodesnewbygo Chemistry Answered 1. If you have 8.0 g of Mg (magnesium) how many grams of O 2 (oxygen gas) is needed to react with the 8.0 g of Mg? (Show your work for full credit, GM - MM - MG) 2 Mg + 10₂ ↑ >>> 2 MgO