Chemistry formula question?

Sodium tetrathionate, an ionic compound formed when sodium thiosulfate reacts with iodine, is 17.01% Na, 47.46% S, and 35.52% O by mass, and has a for

Sodium tetrathionate, an ionic compound formed when sodium thiosulfate reacts with iodine, is 17.01% Na, 47.46% S, and 35.52% O by mass, and has a formula mass of 270 u. What is its formula?

or:Sodium tetrathionate, an ionic compound formed when sodium thiosulfate reacts with iodine, is 17.01% Na, 47.46% S, and 35.52% O by mass, and has a formula mass of 270 u. What is its formula?

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