# Homework Help: Mole problems

1. Nov 28, 2007

### BittersweetLove

1. The problem statement, all variables and given/known data

*How many moles of LiH are required to make 1 mole of LiAlH4?

* 6 moles of LiH will produce how many moles of LiAlH4?

Can someone help me get started on these?

2. Dec 2, 2007

### Gokul43201

Staff Emeritus
You start by writing the balancing the relevant equation. Can you do that for the above reaction?

3. Dec 5, 2007

### MichaelXY

I am learning the same stuff in class, I can clearly see from what is written that there is a 4 to 1 ratio, so I think we get 1.5 moles. What I don't see is how the equation works. I wrote it out and somethings seems missing.
LiH + Alxx ----> LiAlH4 + xx
I got myself a bit confused, should there be something for xx or is it just Al?

P.S. I would not normally encroach on someone elses question, but since two weeks have passed, I figured it would be ok.

Last edited: Dec 5, 2007
4. Dec 6, 2007

### Gokul43201

Staff Emeritus
Good thinking. Alxx is actually $AlCl_3$.