Antoine Lavoisier is credited with the discovery of the law of conservation of mass. The law states that in a chemical reaction, matter is not created or destroyed but preserved. Which equation correctly models this law? H2 + Cl2 ---> 2HCl

H2 + Cl2 ---> HCl

H + Cl ---> 2HCl

2H2 + Cl2 ---> 2HCl2

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

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