Question

1. how many atoms are in 6.85 mol of neon?

Explanation:

Step1: Recall Avogadro's number

Avogadro's number ($N_A$) is $6.022\times 10^{23}$ atoms/mol.

Step2: Calculate the number of atoms

We use the formula $N = n\times N_A$, where $n = 6.85$ mol and $N_A=6.022\times 10^{23}$ atoms/mol. So $N=6.85\times6.022\times 10^{23}$ atoms.
$N = 4.12507\times 10^{24}$ atoms.

Answer:

$4.13\times 10^{24}$ atoms