Answer: Antoine Lavoisier.
- A Antoine Lavoisier
- B John Dalton
- C Joseph Proust
- D Amedeo Avogadro
Correct answer: A. Antoine Lavoisier
Explanation: Antoine Lavoisier established the law of conservation of mass: the total mass of reactants equals the total mass of products in a chemical change.
Mass connects to moles via molar mass, and moles connect to particle count via Avogadro's number or to gas volume via the 22.4 L/mol rule at STP.
Concept context
The mole is chemistry's counting unit. Learn to relate mass, volume, and number of particles using Avogadro's number and molar mass, the foundation of all stoichiometry and reaction calculations.