# Mole concept

1. Feb 8, 2016

### brycenrg

1. The problem statement, all variables and given/known data
When a problem says 76 moles of P4O10 contains how many moles of P.
I can't seem to see why 76 moles of this molecule would contain more moles in it.

2. Relevant equations

3. The attempt at a solution
I know the answer is 76 moles of P = 76 * 4
but how could a compound P4O10 that has 76 moles have 76 moles of P and 76 moles of O. in my head thats like saying 25 lb back of wine bottles is 25 lb of wine + 25 lb of bottles. Can anyone help me fix this brain dump?

2. Feb 8, 2016

### Bandersnatch

Mole is a number, like say 10 or a dozen or 512. If you have a dozen molecules of P4O10, then there are four dozens of P and 10 dozens of O in it.
Same with moles.

3. Feb 8, 2016

### vela

Staff Emeritus
There's a difference between the number of $P_4 O_{10}$ molecules and the number of $P$ atoms.