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The atomic ratio between the atoms is shown by the formula itself to be 1:3 for P:Br.

The gram Atomic Mass of phosphorus is 30.9738, and the gram atomic mass of bromine is 79.904. Therefore, the ratio of phosphorus to bromine by mass is 30.9738/(3* X 79.904) or about 0.12921 to the justified number of significant digits.

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*This is an exact digit

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Q: What is the ratio of phosphorous to bromine in 2 P 3 Br2 -- 2 PBr3?
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