Answer:
The scientist who discovered the relationship between the relative volume of a gas and the stoichiometric coefficients in a chemical equation was Gay-Lussac
Step-by-step explanation:
Gay -Lussac was a french chemist he proposed 2 fundamental laws of gases in 19th century.
He studied the relationship between the pressure of a gas and its absolute temperature.
Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.