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Multiply each element's atomic weight times its subscript and add the answers.

H: 1.00794 x 3 = 3.02382

P: 30.973761 x 1 = 30.973761

O: 15.9994 x 4 = 63.09976

Total = 3.02382 + 30.973761 + 63.09976 = 97.09734

The formula mass of phosphoric acid is 97.09734.

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12y ago
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Q: What is the formula mass of the compound Phosphoric acid H3PO4?
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