Question

On what chemical law, balancing of chemical equation is based? S (s) + HCl (g)

Answer 1

but sulphur does not react with hydrochloric acid.
hydrochloric acid does not react with nonmetals. hydrochloric acid reacts with only metals, metal hydrogen carbonates, and metal carbonates

Answer 2

Hey bro,
This chemical equation is based on the displacement reaction.

Unbalanced=> S(s)+HCl(g)
Balanced=>S(s)+ 2HCl(g) --> H2S(s)+Cl2(g)

perfectly fine pure correct answer.
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