The reaction of ethene with aqueous potassium manganate(VII), KMnO₄, produces ethane-1,2-diol, CH₂OHCH₂OH. Data: molar mass of ethane-1,2-diol = 62gmol−1 In an experiment, KMnO₄ containing only 18O reacts with ethene. Suggest how the mass spectrum of ethane-1,2-diol data could be used to decide whether the oxygen atoms in ethane-1,2-diol came from the manganate(VII) ion, water, or a combination of the two