10 L of Cl2 gas reacts with 40L of H2 gas under same condiitions of temperature and pressure. How much volume of HCl should be produced?

Explanation

The balanced chemical equation 𝐻2 + 𝐶𝑙2 = 2𝐻𝐶𝑙 shows that each mole of Cl2 produces two moles of HCl. At constant temperature and pressure, volumes of gases are proportional to moles. Thus, 10L of Cl2 will react with 10L of H2 to produce 20L of HCl. Cl2 is the limiting reactant, and the excess H2 remains unreacted. Option C is correct; other options either misinterpret the stoichiometry or the limiting reactant concept.