Does anybody know how to do chemical equations? i have 10 that need to be answered. the sheet is due today and i have no clue on how to do them well.

I'll give you the general method based on the example you provided :

n Fe +m H2S04 ---> p Fe2(SO4)3 +q H2
We want to find n,m,p and q.

The idea it to make sure the conservation of the elements happens. If you have 3 Oxygen on the left side, you need to have 3 Oxygen on the right side.

Here we have :
Elements | Left side (reagents) :  |  Right side (products) : 
-----------------------------------------------------------------------------------
Fe                         n                             2p
H                         2m                            2q
S                          m                             3p
O                         4m                          4*3p

We want m,n,p,q to be as small as possible so let's start by trying m=1:
n Fe +H2S04 ---> p Fe2(SO4)3 +q H2
From that we can see that:
* Conservation of Oxygen, Sulfur : p=3

That gives us n Fe +3H2S04 ---> Fe2(SO4)3 +H2

The conservation of Hydrogen thus gives :
n Fe +3H2S04 ---> Fe2(SO4)3 +3H2

The conservation of Fe then yields n=2

Because a model would make the investigation easier to understand

What do you not know about it