The molecular formula of a non-stoichiometric tin oxide containing Sn (II) and Sn (IV) ions is Sn4.44O8.Therefore, the molar ratio of Sn (II) to Sn (IV) is approximately

In 1 mol of the given substance the number of moles of Sn (II) =  x moles and number of moles of Sn (IV) = y moles.∴ x + y = 4.44 and 2x + 4y = 16By solving x = 0.88 and y = 3.56∴ mole ratio of Sn (II) to Sn (IV) is 0.247:1 ≅ I :4