Molecules and the moles can be interconverted into each other with the help of the Avogadro's number. In 8.5 x 10⁻² moles of hydrogen fluoride, there are 51.17 × 10²¹ molecules.
Avogadro's number is the special number that converts the moles into molecules and vice versa. The value of the Avogadro's number is 6.02 x 10²³.
If 1 mole of HF has 6.02 x 10²³ molecules then,
8.5 x 10⁻² moles of HF will have:
(8.5 x 10⁻²) × 6.02 x 10²³) = 51.17 × 10²¹
Therefore, 51.17 × 10²¹ molecules are present in HF.
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