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(a) Define and explain mole and Avogadro's number with examples.
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Avogadro's number is defined as the number of elementary particles per mole of a substance. it is equal to 6.022*10^23 mol^-1 and is expressed as the symbol Na. Avogadro's number is a similar concepts to that of d dozen or a gross. a dozen molecules is 12 molecules
the mole is the SI measure of quantity of a "chemical entity " such as atoms, electrons, or protons. it is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12 so, 1 mol contains 6.022*10^23 elementary entities of substances
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