Help with chemistry question? Need urgent!

Posted on 2017-03-03 18:23:00 in Chemistry by STEPHANIE

If 12.32 mL of 0.1000 M Ba(IO4)2 (MM=519.1) are needed to titrate a 2.500g sample containing Fe3(PO4)2 (MM=357.5) in an acidic media to its endpoint, calculate the percent Fe3(PO3)2 in the sample. [HINT: Needless to say, you must first balance the chemical equation and then calculate the number of grams of Fe3(PO4)2 present in the 2.500g sample.] 

I balanced it to: 
4H^+ + IO4^- + 4Fe^2+ ---> 4Fe+3 + IO2^- + 2H2O 

Help I keep getting 1.761g of the sample but the answer in the book says it's 1.174g? If I get the grams of Fe3(PO3)2 wrong then I can't solve the percent of Fe3(PO4)2 in the sample! 

Can someone please explain it step by step?? 

I will give points to whoever answers correctly, thanksa

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