One mole of H₂O correspond to A. 6.02 x 10²³ molecules of H₂O.
Avogadro Number or Avogadro Constant is called the number of particles that constitute a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number applies to any substance.
In this case the avogadro number represents the amount of molecules that exist in one mole of a pure substance, water being in this example.
Finally, one mole of H₂O correspond to A. 6.02 x 10²³ molecules of H₂O.
To learn more about one mole from the given link:
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