# How do we know which chemical comes after mixing 3 or more chemical, on paper work like balance equation, example : H2 + NaCl + So4 ~ ? What is the product how we can know

So to your question; you mixed dihydrogen gas, sodium chloride, and sulfate dianion (i.e. $S {O}_{4}^{2 -}$). This does not correspond to any chemical reaction I know. I think you have made a mistake transcribing the question.