Regarding the formula al2o3 which of the following is accurate?
a. the coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance.
b. the subscript 2 indicates that two atoms of oxygen are present in the substance.
c. the chemical symbol al indicates that oxygen is present in the substance.
d. the subscript 2 indicates that two atoms of aluminum are present in the substance

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: