Which number is called Avogadro's constant, named after the 19th century scientist Amedeo Avogadro?

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Accepted Answer

1. Avogadro's constant is the number of entities (atoms, molecules) in one mole and has the exact value

$6.02214076	imes10^{23}\ \mathrm{mol^{-1}}$.

2. Compare the given options:
   - (1) $6.022	imes10^{23}$ — matches the known value (rounded).
   - (2) $6.020	imes10^{20}$ — three orders of magnitude too small.
   - (3) $6.032	imes10^{19}$ — four orders of magnitude too small.
   - (4) $6.012	imes10^{21}$ — two orders of magnitude too small.

3. Therefore option (1) is correct.

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