What is the mole ratio of Fe_3O_4 to Fe?

1 Answer
anor277
Jan 27, 2018

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?

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