If 2.43 g of magnesium burns in oxygen to produce 4.03 g of magnesium oxide, what is

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If 2.43 g of magnesium burns in oxygen to produce 4.03 g of magnesium oxide, what is the mass of reacting oxygen gas? 

(a) 1.60 g 

(b) 2.43 g 

(c) 4.03 g 

(d) 6.46 g 

(e) Impossible to predict from the given information.

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