Macroscopic: properties that are directly observable. The opposite of microscopic.

Microscopic: in chemistry, implies something that happens at the molecular (or atomic) level, and therefore undetectable through normal observation. The opposite of macroscopic.

Molarity: concentration unit symbolized by M and measured in mol per L (mol/L or mol L^-1₎, where

• mol = moles of solute
• L = litres of solution

Note: the word "molarity" is still an extremely common unit in chemistry, however it is considered an obsolete unit.  The proper units used for molarity should be mol per decametre (mol dm^-3) or mol per litre (mol L^-1) which are equivalent units to molarity.

Molar Mass: the mass of one Avogadro's number (1 mole) of atoms or molecules.  The molar mass of an atom is listed on almost all periodic tables.  The molar mass of a molecule is found by summing all the masses of all the atoms that make up the molecule.  Here is an example of calculating a molar mass of KHC₈H₄O₄.   Check this site if you need more information about molar mass.