From a titre to a concentration

A flask holds iron(II) solution. You will turn the titre of permanganate into moles, then into the concentration of iron(II), and check the answer with equivalents.

The idea. Moles are concentration times volume in litres. One permanganate ion reacts with five iron(II) ions. At the end point, the equivalents of the two reagents are equal.

Your tasks.

1. Set mol_mno4 to the moles of permanganate used.
2. Set mol_fe to the moles of iron(II) in the flask.
3. Set conc_fe to the concentration of iron(II), in mol/L.
4. Set equivalents to the equivalents of permanganate used. Its n-factor is 5.