When a volume of H2 reacts with an equal volume of Cl2 (assume you have 1 L of each) at the same temperature and pressure, what volume of product having the formula HCl is formed?

Question

Question 4 answers

Answer 1

Start with the equation

Cl2 + H2 = 2HCl

so one mole of each forms 2 moles of HCl.

We know that number of moles is equivalent to volume. So 1 volume of each forms 2 volumes of HCl (equal volumes of gases contain the same number of moles under the same conditions).