how do i calculate the number of moles of ammonium iron (ll) sulphate (NH4)2 Fe(SO4)2.6H2O in 1dm3 of solution?

Answer 1

A cubic decimeter is one liter. What is the concentration (Molarity) of the solution? You need to know that to answer the question.

The mass of one mole of the hydrated compound is easily calculated. Have you tried that?

Answer 2

Yea

Answer 3

Calculate the number of moles of iron 2 ammonium sulphate solution