What was Antoine-Laurent Lavoisier's most important contribution to chemistry in 1789?

Correct option is A

Correct Answer is (a) Law of Conservation of Mass

Antoine-Laurent Lavoisier, often referred to as the "Father of Modern Chemistry," formulated the Law of Conservation of Mass in 1789. This fundamental principle states that "Mass can neither be created nor destroyed in a chemical reaction." His experiments demonstrated that the total mass of reactants in a closed system remains equal to the total mass of products after a chemical reaction. This discovery played a crucial role in the development of chemical stoichiometry and laid the foundation for modern chemistry.

• Lavoisier’s work led to the overthrow of the phlogiston theory, which previously dominated chemical thought.
• He was instrumental in developing the first systematic chemical nomenclature, naming elements like oxygen and hydrogen.
• His experiments with combustion showed that oxygen is required for burning, leading to a better understanding of oxidation.
• Lavoisier contributed to the creation of the metric system for standardizing measurements in science.
• He co-authored the first modern chemistry textbook, "Traité Élémentaire de Chimie" (1789).
• His work ultimately paved the way for atomic theory, which was later developed by John Dalton.