Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kamilast on November 08, 2020, 08:59:21 AM

Title: Mole Fraction of Iron
Post by: kamilast on November 08, 2020, 08:59:21 AM
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.
Title: Re: Mole Fraction of Iron
Post by: Borek on November 08, 2020, 09:50:15 AM
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?
Title: Re: Mole Fraction of Iron
Post by: kamilast on November 08, 2020, 10:13:24 AM
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  :(
Title: Re: Mole Fraction of Iron
Post by: Borek on November 08, 2020, 03:57:51 PM
susbstances are water, Fe2+ and 2Cl-

That's OK.

Quote
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)?
Title: Re: Mole Fraction of Iron
Post by: kamilast on November 08, 2020, 04:42:09 PM
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!
Title: Re: Mole Fraction of Iron
Post by: Borek on November 08, 2020, 05:04:12 PM
Please post your final solution for others to learn :)