Her behavior has been reinforced (i.e. strengthened). Reinforcement can be external or internal and can be positive or negative. If a child wants approval from parents or peers, this approval is an external reinforcement, but feeling happy about being approved of is an internal reinforcement.
It remained to define the unit of amount of substance by fixing the corresponding mass of carbon 12; by international agreement, this mass has been fixed at 0.012 kg, and the unit of the quantity amount of substance was given the name mole (symbol mol).
Rating Newest Oldest. Best Answer: A mole is a number of atoms or molecules of a substance or element equal to 6.02 x 10^23 (Avogadro's number). For example: a mole of chlorine is just 6.02 x 10^23 chlorine atoms. The molar mass of a molecule is what the mass would be if you had 6.02 x 10^23 of those molecules.