Stoichiometric ratio calculation

  • Thread starter Rajini
  • Start date
  • #1
611
2

Main Question or Discussion Point

Dear all,

I am trying to synthesis a compound as given the paper below. Can someone help me of how to calculate the stoichiometric ratio and amount of each compound (i.e. Nd pieces, As, Fe, Fe2O3, FeF3 powders) required to prepare the same compound as in that paper. Especially I don’t know the balanced equation.

Preparation of superconducting compound is given in the following paper:
Doi: 10.1209/0295-5075/82/57002
The superconducting compound is Nd[O0.89F0.11]FeAs.
It is mentioned in that paper as follows:
Nd pieces, As, Fe, Fe2O3,FeF3 powders (the purities of all starting chemicals are better than 99.99%) were mixed together according to the nominal stoichiometric ratio of Nd[O0.89F0.11]FeAs, then ground thoroughly and pressed into small pellets.

thanks and regards, Rajini.
 

Answers and Replies

  • #2
Borek
Mentor
28,404
2,803
You can't balance a reaction in a standard way, when the compound has non-integer coefficients. But the stoichiometry still holds - 1 mole of Nd[O0.89F0.11]FeAs contains 1 mole of Nd, 1 mole of Fe, 1 mole of As, 0.89 moles of O and 0.11 moles of F. Assume you are going to make 1 mole. Start calculating how much Fe2O3 you need to get correct amount of oxygen, then how much FeF3 for fluorides, then check how much Fe you already have and calculate how much Fe to add to make its total up to 1 mole. The rest should be obvious.
 
  • #3
611
2
solved

Hello Borek,

I got your suggestion:
Is the following correct?
Nd + As + 0.3699Fe + 0.2967 Fe2O3 + 0.0367 FeF3 -> Nd[O0.89F0.11]FeAs.
I think I can now calculate grams of each compound reruired to prepare..
Regards, Rajini.
 
  • #4
Borek
Mentor
28,404
2,803
Looks OK to me.
 

Related Threads on Stoichiometric ratio calculation

Replies
8
Views
835
Replies
11
Views
12K
Replies
2
Views
2K
Replies
7
Views
910
Replies
3
Views
2K
Replies
8
Views
6K
Replies
7
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
8K
Top