Art, Music, and Creative Writing homework help

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I dont understand this exercise help please :(An 8mL sample of  H3PO4 required 28.3mL of an 0.100 M NaOH solution at the equivalence point.  How many grams of H3PO4 were present in this sample? 3NaOH(aq) + H3PO4(aq) ——> Na3PO4 (aq) +3 H2O (l)