Question

--------volume-- molarity(mol/L)

trial 1---25.49 25489.99
trial 2---24.67 24670
trial 3---24.61 24610
The moles of can be determined by multiplying the volume of required to reach the endpoint multiplied by the molarity of the . What are the moles of ?

The moles of can be calculated by using the mole ratio from the balanced equation. What are the moles of ?

The mass of in the sample can be calculated by multiplying the moles of by the molecular weight of . What is the mass of in the sample?

The percent iron in the unknown sample can be determined by

help!