Determine the mass percent of iron in a sample of iron ore. A student finds the mass of the sample and then dissolves it in acid to a total volume of 25.00 mL. using a buret, the student titrates the 25.00ml solution with 0.017m K2Cr2O7. The following reaction occurs during the titration:
__Cr2O7^-2(aq) + __ Fe^+2(aq) + __ H^+ -> __Cr^+3(aq) + __ Fe^+3(aq) + H2O(l)

Mass of Sample: 0.36g
Buret reading at end point: 45.52 mL
Initial buret reading: 15.05 mL

a) Balance the equation with the simplest ratio
b) Find the volume used of the titrant (Cr2O7^-2)
c) Find the moles of titrant
d) Find the moles of Fe
e) Find the mass of Fe
f) Find mass percent of Fe in the sample