Chapter 2, Problem 20E

When mixtures of gaseous ${\text{H}}_{\text{2}}$ and gaseous ${\text{Cl}}_{\text{2}}$ react, aproduct forms that has the same properties regardless ofthe relative amounts of ${\text{H}}_{\text{2}}$ and ${\text{Cl}}_{\text{2}}$ used.

a. How is this result interpreted in terms of the law ofdefinite proportion?
b. When a volume of ${\text{H}}_{\text{2}}$ reacts with an equal volume of ${\text{Cl}}_{\text{2}}$ at the same temperature and pressure, what volumeof product having the formula HCl is formed?