Answer:
14.1 mol
Explanation:
1 mole of a substance contains always the same number of molecules, which is equal to Avogadro number:
[tex]N_A=6.022\cdot 10^{23}[/tex]
Which means that 1 mole of a substance contains [tex]N_A[/tex] molecules.
Therefore, this means that [tex]n[/tex] moles of a substance will containe a number of molecules equal to
[tex]N=nN_A[/tex]
In this problem, we know that the substance contains
[tex]N=8.50\cdot 10^{24}[/tex] molecules
Therefore, the number of moles in this substance is:
[tex]n=\frac{N}{N_A}=\frac{8.50\cdot 10^{24}}{6.022\cdot 10^{23}}=14.1 mol[/tex]
