The mass percentage of O in a potassium ...

The mass percentage of O in a potassium salt, `K_(2)S_(2)O_(x)` , is 36.0%. What is the formular of the polyatomic ion?

`S_(2)O_(3)^(2-)`

`S_(2)O_(5)^(2-)`

`S_(2)O_(7)^(2-)`

`S_(2)O_(8)^(2-)`

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