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???? How many moles in a drop of water? Methods and calculations ✅ calculation, number of entities, mass of a molecule, quantity of matter ???? VIDEOS ON THE SAME THEME ???? ▶️ Playlist: 2nd year course Physics-Chemistry • ???? HIGH SCHOOL ???? ▶️ Calculate the number of atoms, molecules or ions? • How many MOLECULES in a tablet of... ▶️ Calculate the number of moles? 2nd year course • How to calculate the number of MOLES?... ????Second year program 2nd year: → Count the entities in a sample of matter. → Number of entities in a sample. → Determine the number of entities and the amount of matter (in mol) of a species in a sample mass.