400. As a result of the interaction of 21.3 g of potassium permanganate (KMnO4) with hydrochloric (hydrochloric) acid (HCl), a certain amount of gaseous chlorine (Cl2) was obtained. Calculate how much manganese (IV) oxide (MnO2) is required to obtain the same amount of Cl2 when this oxide reacts with the same acid.

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