Manganese and oxygen form a compound with an empirical formula of MnO2. If the actual molecular mass of of the compound is 173.8 g, what is the molecular formula?

Answer 1

Molar mass of empirical formula = 86.94

How many of these are present in 173.8 g?

173.8/86.94 = 1.999 = 2

So, molecular formula is twice the empirical formula = Mn₂O₄

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