The state's landlord-tenant laws protect people living in dwellings owned or leased by others. A person need not be listed on a formal lease to gain protection under these laws, but may gain protection by establishing residence in a place.
The mole is useful in chemistry because it is defined such that the mass of Avogadro's number of particles (atoms or molecules) of a substance (the molar mass) is equal to the sum of the numerical values of the atomic masses of its constituent elements.
The Si-unit mol is used in chemistry for three reasons: 1  The quantity of atoms/molecules is the logical unit of chemistry (Reactions have to be balanced). 2  Atoms/molecules can't be counted (It works for people and TV's), but have to be measured using mass or volume, and then converted into a quantity (e.g. mol/kg)