Please balance the reaction that follows?

Question

(NH ) SO .Cr (SO) . 24H O -heating-NH + SO +

4) 2 4 2 4)3 2 3 2

+ Cr O

2 3

+H O

2

ammonium sulphate.cromic sulphate.24h20 on heating gives ammonia+sulphur dioxide+cromic oxide+h20

Answer 1

(NH4)2SO4Cr2(SO4)3 * 24H2O --> NH3 + SO2 + Cr2O3 + H2O

To balance, just make sure the number of moles for each element is equal on both sides.  I'm sure you can count and multiply.

[Answer: see above]

Answer 2

You have given equation for Chrome-alum. (NH4)2SO4Cr2(SO4)3 * 24H2O --> NH3 + SO2 + Cr2O3 + H2O

It is not easy to decompose it into Ammonia and SO2 by heating, It is a stable compound and losses only water on heating.

So the first step will be

(NH4)2SO4Cr2(SO4)3 * 24H2O -->

(NH4)2SO4Cr2(SO4)3  + 24H2O

In Second step, if you are heating it for very high temperature - temperature of pyrolysis -  Decomposition may take place according to

(NH4)2SO4Cr2(SO4)3 ->

2 NH3 + Cr2O3 + 4SO3 + H2O

SO3 is a stable compound - it is very difficult to dissociate it to SO2. If it takes place it will be

4SO3 -> 4 SO2 + 2O2

Overall you can write

(NH4)2SO4Cr2(SO4)3 * 24H2O -->

2 NH3 + Cr2O3 + 4SO2 +2O2 + 25 H2O