Manganese ions (Mn^2+) can be oxidised by Persulphate ions S2O8^2- according to the following half-e — d and f Block Elements Chemistry Question

Question

Manganese ions (Mn^2+) can be oxidised by Persulphate ions S2O8^2- according to the following half-equations,<br>S2O8^2- + 2e^- $\rightarrow$ 2SO4^2-<br>Mn^2+ + 4H2O $\rightarrow$ MnO4^- + 8H^+ + 5e^-<br>How many moles of S2O8^2- are required to oxidise 1 mole of Mn^2+ ?