Magnesium Oxide decomposes to produce 3.54 grams of oxygen gas. How many grams of magnesium oxide decomposed?

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Explanation:

Magnesium oxide

It is MgO Its molecular mass is : 24 + 16=40 g When MgO decomposes it forms = 3.54 g of oxygen gas when 40 g of MgO decomposes it forms = 16g of oxygen or we can say that : 16g of oxygen is produced when 40 g of MgO is decomposed. 1g of oxygen will be formed from = 40/16g of MgO 3.54 g of oxygen will be formed = 40/16 x 3.54 = 8.85g of MgO