Answer:
The coefficient of hydrogen chloride (HCl) in a chemical equation is typically 1. This means that in a balanced chemical equation, one molecule of hydrogen chloride (HCl) will produce one molecule of each element, hydrogen (H) and chlorine (Cl), on the reactant side and the product side of the equation. For example, in the balanced equation:
HCl(g) → H2(g) + Cl2(g)
The coefficient of HCl is 1, indicating that one molecule of HCl decomposes to form one molecule of H2 and one molecule of Cl2.