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^₎, 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/dm³) or mol per litre (mol/L) which are equivalent units to molarity (M).

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.