Magnesium oxide decomposes into magnesium and oxygen. If 12.09g of magnesium oxide decompese to form 7.29g of magnesium, what mass of oxygen gas is also realeased in the reaction?


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John McCann Profile
John McCann answered

Since there is only one species on the left to drive the reaction....,

Balanced equation.

2MgO  --> 2Mg + O2

12.09 g MgO (1 mole MgO/40.31 g)(1 mole O2/2 mole MgO)(32 g/1 mole O2)

= 4.80 grams of oxygen gas produced


As you can see from the answer the stoichiometry was not really necessary ( except for instructional purposes ) as simple arithmetic could have given the same answer..

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