# Thermite reaction

1. Jan 19, 2005

### chemister

I am still having problems with this problem....

It deals with the thermite reaction $$Fe_{2}O_{3}+2Al----2Fe+Al_{2}O_{3}$$

If 1 mole of Al is reacted with 10.0g of $$Fe_{2}O_{3}$$, how many grams of unreacted Al would remain?

2. Jan 19, 2005

### NateTG

How many moles of $Fe_2O_3$ are there in 10g?

3. Jan 19, 2005

### chemister

There are about 0.0626 moles of $$Fe_{2}O_{3}$$ in 10.0g

4. Jan 20, 2005

### poolwin2001

This is a double post.
Anyway no:moles of $Fe_2O_3$ reacted will be twice no:moles of aluminium.
if only 0.0626 moles of $Fe_2O_3$ is present then correspondingly 0.0626*2 moles of Al will react.

5. Jan 21, 2005

### archie

Al remaining

Assuming 10 g of Fe2O3 = 0.0626 moles (too lazy to look at periodic table),
then Al remains is (1 - (2*0.0626))= 0.8748 mol of Al = approx. 23.6 g of Al