Since the water:H3PO4 molar ratio from the well balanced eq’n is 3:1, then whatever water is, you have the right to divide through 3 to get H3PO4. But a much better way to see it is with unit evaluation method. Start with the given and multiply by the 3:1 molar proportion with the units set up to cancel to create the devices you desire for an answer. Something prefer this:

17.89 mol H2O x 1 mol H3PO4/3 mol H2O

The devices of mol H2O publication leaving devices of mol H3PO4 as the devices of the answer. Likewise note that together predicted, the answer is 17.89/3. Hope the helps.


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