The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. Consider the reaction:
P2O5(s) + 3 H2O(l) → 2 H3PO4(aq)

If 16.62 g P2O5 is mixed with 19.90 g H2O, calculate the theoretical yield (g) of H3PO4 produced by the reaction.
(The answer needs to be in g)