Which statement is a correct expression of the law of conservation of mass? a. the total mass is unpredictable in a chemical reaction. b. the total mass remains the same during a chemical reaction. c. the total mass decreases during a chemical reaction. d. the total mass increases in a chemical reaction.

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).

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