A different brand of iron tablet was analysed by titration with 0.0093 mol. L-1 potassium dichromate via the reaction listed below; Cr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O
In this experiment 4 tablets were crushed and dissolved in 200 cm3 of dilute acid. 25cm3 of this solution was used in the titration. The results of the titrations were as follows;

Titration
Volume dichromate (cm3)
1
33.0
2
32.05
3
32.15
4
32.10

Calculate the concentration of iron used in the titration (4 dp).

Calculate the number of moles in the original iron solution (200 cm3) (5 dp)

Calculate the mass of iron in the solution (grams, 4 dp).

Calculate the mass of iron each tablet (miligrams, 1 dp)