Avogadro's number is the number of molecules present in (a) 1 g of molecule (b) 1 atom of molecule (c) 1 mole (d) 1 litre of molecule

1 mole

The number of particles present in one mole of any substance is a fixed value of 6.022 x 1023. This value is called Avogadro’s number.The number of units present in one mole of any substance is called Avogadro’s number or Avogadro’s constant. The units may be electrons, ions, atoms, or molecules, depending on the character of the reaction and the nature of the substance.

Therefore, the correct option is (c)

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