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JoshEast
The number of moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 × 10²³] (which is used as a standard in the world of moles).

Now,

          if     6.02 × 10²³ atoms are found in 1 mole
   then let    4.5 × 10²¹ atoms are found in     x

⇒     x  =    (4.5 × 10²¹)  ÷  (6.02 × 10²³)

            =  0.00748 mol

∴ 4.5 x 10²¹ atoms has in ~ 0.00748 moles

74.72 × 10⁻⁴ moles present in 4.5 × 10²¹ atoms.

How to find the number of moles ?

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

What is Avogadro's Number ?

Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's constant / Avogadro's number.

Avogadro's number  = 6.022 × 10²³

Now put the values in above formula we get

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

                             = [tex]\frac{4.5 \times 10^{21}}{6.022 \times 10^{23}}[/tex]

                             = 74.72 × 10⁻⁴ moles

Thus, from the above conclusion we can say that 74.72 × 10⁻⁴ moles present in 4.5 × 10²¹ atoms.

Learn more about the Avogadro's Number here: brainly.com/question/859564

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