What is the mole ratio of #Fe_3O_4# to #Fe#?

1 Answer
Jan 27, 2018

Answer:

Suppose instead I had a dozen formula units of #Fe_3O_4#...

Explanation:

I think that by using simple arithmetic you should very quickly be able to tell me that I had 36 iron atoms, and 48 oxygen atoms....do you agree?

Here we have a #"mole"# of #Fe_3O_4# units, i.e. a mass of #231.4*g#...but a mole specifies Avogadro's number of particles....we write #N_A=6.022xx10^23*mol^-1#.. And so we can use the #"mole"# as a collective number precisely as we do the #"dozen"#.

And so we gots #1*mol# #Fe_3O_4#...we gots #3*mol# of iron atoms, and #4*mol# of oxygen atoms...

If I got one mole of #P_4O_10#, can you tell me the numbers and the masses of the constituent atoms?