Software for predicting chemical reactions
For predicting chemical reaction you should use classical mechanics to take in account the simple interactions between the molecules  and quantum mechanical for all the aspects concerning the molecule itself and complex interactions.
Knowing the principal parameter such as temperature and pressure that could describe the system with the classical mechanics (kinetic energy etc. etc.) is not enough for predicting the reaction with ab initio methods. 
Adding the quantum mechanical contribute is mandatory and quite hard to do. A amateur chemist do not have neither the skills nor the computation power require to make such calculations. For the moment you can't do that with any software but the last Nobel was won by three theoretical chemists who are dealing with this topic. Have a look here for more information.

In your case where the reactions are well known you can use a chemical reactions database like the NIST one.
This is a simple query:


And this is the...