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).
Number: A mole is an amount of a substance equal to a quanity. of 602 sextillion particles (atoms, molecules, or unit cells). Written as 602,000,000,000,000,000,000,000 = 6.02 x 1023. Mass: A mole is the atomic mass (element), molecular mass. (covalent compound) or the formula mass (ionic compound) of a. substance expressed in grams. Since atoms, molecules and unit cells are extremely small, a mole is a huge number of particles but a small mass.