You are Here: Home

# Quick guidance Watch

1. Hey Guys am not sure if l'am thinking of something else when calculating ions in a compound but if l am can someone point me in the right direction please

3.42g of Al2(SO4)3

I did M/GFM got 0.01 mol
then 0.01* 6.02*10^23= 6.02*10^21 ions

Am l thinking of something else entirely?

Cheers
2. (Original post by Karen72)
Hey Guys am not sure if l'am thinking of something else when calculating ions in a compound but if l am can someone point me in the right direction please

3.42g of Al2(SO4)3

I did M/GFM got 0.01 mol
then 0.01* 6.02*10^23= 6.02*10^21 ions

Am l thinking of something else entirely?

Cheers
You've found the number of molecules.
But the compound is made up of Aluminium and sulfate ions, so one molecule = 2+3=5 ions, so you need to multiply the number of molecules by 5 to get the number of ions.
3. Thanks a lot! I got my head around it a little while ago!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 5, 2012
Today on TSR

### Should I ask for his number?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE