Step 1 Assuming 100 g, V is 56 g and O is 44 g

$\mathbf{56}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{V}}\mathbf{}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{V}}{\mathbf{50}\mathbf{.}\mathbf{94}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{V}}}$** = 1.10 mol V**

$\mathbf{44}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{O}}\mathbf{}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{mol}\mathbf{}\mathbf{O}}{\mathbf{16}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{O}}}$** = 2.75 mol O**

Step 2 Divide each mol by the least moles

Vanadium forms four different oxides in which the percent by mass of vanadium is respectively 76 % , 68 % , 61 % , and 56 % .

Find the formula of the fourth oxide.

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