when 2.3gm of barium chloride reacts with 4.6 gm of sodium sulphate then 6.9gm of products are formed which phenomena is involved in it

Dear student
This calculation is according to the LAw of Conservation of mass.
the mass of all reactants = mass of all products
Also, mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. 
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Regards

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