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.
You can calculate the molar mass or mass of one mole of an element or molecule if you know the formula for the substance and have a periodic table or table of atomic masses. Here are some worked examples of the molar mass calculation.