159 l of hydrogen gas reacts with excess chlorine gas. what is the maximum amount of gas product that can be formed at stp

At standard conditions, the standard volume for any gas is 22.4 L/mol. Therefore the amount of moles of hydrogen gas is:

Moles of H2: 159 L/22.4 L/mol = 7.1 mol

The reaction would be:

H₂ + Cl₂ - - > 2 HCl

Moles of HCl produced: 7.1 mol H₂ * 2 mol HCl/1 mol H₂ = 14.2 mol HCl