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Let's understand the concept of MOL very calmly. It is impossible to talk about chemistry without talking about MOL. Is mole mass? Is mole volume? Is mole 6.02x10ˆ23? In fact, mole indicates that we have a set of 6.02x10ˆ23 units of something. We have to be very careful to know MOL of what???? Let's learn this vase concept for stoichiometry.