Question

How many mol of sodium corresponds to 1.0 x 10^15 atoms of sodium?

Answer 1

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 = 6.02*10^23 approx.
So n=N/Na (n=mole number, N=number of atoms, Na=Avogadro number)
n=1.0*10^15/6.02*10^23
n=1.6 * 10^-9

So 1.0*10^15 atoms of Sodium represent 1.6*10^-9 mol.

Hope this Helps! :)

Answer 2

The moles of sodium are
`1.6606* 10^(-9) moles`.

Step-by-step explanation:

Moles of sodium = n

Number of atoms of sodium , N =
`1.0* 10^(15)`

`N=n* N_A`

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

`n=(N)/(N_A)=(1.0* 10^(15))/(6.022\time 10^(23) mol^(-1))`

n =
`1.6606* 10^(-9) moles`

The moles of sodium are
`1.6606* 10^(-9) moles`.