[kamilast]

I am having problem with exercise  which  is : Calculate the mole fraction of iron ions in an 8% aqueous FeCl2 solution. Could somebody tell me  how to solve it ? Im stuck with this exercise for like 3 hours and  I can't figure out what should I do.

[Borek]

Can you list all substances present in the solution?

Lest's say you have 1 kg of the solution - how much of each of these substances is present?

[kamilast]

My knowledge is not complete in this topic. Well susbstances are water, Fe²⁺ and 2Cl^- (but im not sure about it).

I dont really know how to answer on second question 

[Borek]

susbstances are water, Fe²⁺ and 2Cl^-

That's OK.

I dont really know how to answer on second question 

You are told solution is 8% in FeCl₂ - how many grams of FeCl₂ in 1kg (which is 1000 grams)?

[kamilast]

i did it by poportion and pobably the answer is that 80grams, nextly I counted quantity of moles in FeCl2 and in H2O well i think that im able to do it by myself thank you!

[Borek]

Please post your final solution for others to learn