The chemical equation shows iron(III) phosphate reacting with sodium sulfate. 2 FePO sub 4 plus 3 Na sub 2 SO sub 4 rightarrow Fe sub 2 open paren SO sub 4 close paren sub 3 plus 2 Na sub 3 PO sub 4 What is the theoretical yield of Fe sub 2 open paren SO sub 4 close paren sub 3 if 20 point 0 0 g of FePO sub 4 reacts with an excess of Na sub 2 SO sub 4 ?