8) E

Round up the percentage mass of tungsten = 80%

So percentage mass of oxygen = 20%

We know Moles = Mass / Mr

Moles of W = (80 ÷ 184) = 0.44

Moles of O = (20 ÷ 16) = 1.25

Ratio = 0.44 : 1.25

This gives us an approximate ratio of 1 : 3

So the answer is WO₃

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