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Verified Answer :

The Avogadro number represents the number of units in one mole of a chemical substance.
So to find the mole number of a chemical element, you divide its atom number of the Avogadro number which Na = 6.0210^23 approx.
So n=N/Na (n=mole number, N=number of atoms, Na=Avogadro number)
n=1.010^15/6.0210^23
n=1.6 10^-9

So 1.010^15 atoms of Sodium represent 1.610^-9 mol.

Hope this Helps! :)

Answer:

The moles of sodium are \(1.6606\times 10^{-9} moles\).

Explanation:

Moles of sodium = n

Number of atoms of sodium , N = \(1.0\times 10^{15}\)

\(N=n\times N_A\)

Where ,\(N_A= 6.022\time 10^{23} mol^{-1}\) atoms/ molecules (Avogadro number)

\(n=\frac{N}{N_A}=\frac{1.0\times 10^{15}}{6.022\time 10^{23} mol^{-1}}\)

n = \(1.6606\times 10^{-9} moles\)

The moles of sodium are \(1.6606\times 10^{-9} moles\).

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