Question

Hydrogen gas + chlorine gas yields hydrogen chloride

Answer 1

`H_(2) + Cl_(2) --> 2HCl`

Step-by-step explanation:

Hydrogen and chlorine are both diatomic, which means they occur in molecular pairs as gases. This means you will have two atoms of each on the left in the reactants, so you will need to add a coefficient of 2 to have 2 atoms of each on the right in the products.