How do you do stoichiometry

suppose we have a reaction as follows :

nA + mB ---> pC + qD

where n,m,p,q are natural numbers

these natural numbers are called stoichiometric coefficients .

Eg:

2P + 3Br2 ---> 2PBr3

here, 2, 3 from reactant side and 2 from product side are called stoichiometric coefficients

hope this helps...

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.