mols K3PO4 = grams/molar mass = ?
mols H3PO4 used in the reaction is 1 mol H3PO4 used for every 1 mol K3PO4 produced (look at the coefficients).
grams H3PO4 to start = trams used + grams remaining
Determine the starting mass of each reactant if 46.3 of K3PO4 is produced and 92.8 of H3PO4 remains unreacted.
3KOH + H3PO4 ----> K3PO4 + 3H2O
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