Question

question 5 (1 point) listen how many atoms are in 7.12 mol of gold, au? a) $1.18 \times 10^{-23}$ atoms b) $4.29 \times 10^{24}$ atoms c) $8.46 \times 10^{22}$ atoms d) $4.70 \times 10^{24}$ atoms e) $3.34 \times 10^{26}$ atoms

Explanation:

Step1: Recall Avogadro's number

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

Step2: Multiply moles by Avogadro's number

$\text{Number of atoms} = 7.12\ \text{mol} \times 6.022 \times 10^{23}\ \text{atoms/mol}$
$\text{Number of atoms} = 7.12 \times 6.022 \times 10^{23}$
$\text{Number of atoms} \approx 42.87664 \times 10^{23} = 4.29 \times 10^{24}$

Answer:

b) $4.29 \times 10^{24}$ atoms