[s3a]

I do not know how to do the following question:

Potassium permanganate, KMnO4, is a dark purple crystalline solid used as an antiseptic, and in deodorizers and dyes.

a) How many potassium atoms are there in a 7.238g sample of KMnO4?
b) How many oxygen atoms are there in the above sample?

Answer for a): 2.758*10^22 K atoms
Answer for b): 1.103*^23 O atoms

Any help would be greatly appreciated!
Thanks in advance!

[Borek]

7.238 g - how many moles of KMnO₄?

How many molecules per mole?

How many potassium atoms per molecule?

[s3a]

Oh I get it! The "How many potassium atoms PER MOLECULE?" is what cleared it for me. Thanks!