Which of the following describes a potential problem with case studies? They generally involve too few participants to allow meaningful conclusions.
They generally involve too many participants to allow meaningful conclusions.
They are generally conducted by people who are untrained in scientific observation.
They are generally biased due to the patient's awareness of their illness.

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:

the answer is c

tell me if wrong

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)