Question

How many mole ${CO}_2$ molecules are represented by $1.8\times {10}^{24}$ atoms?

• A. 1
• B. 2
• C. 3
• D. 4
• E. 5

Answer 1

The correct option is A 1

The Avogadro's number is $6.023\times {10}^{23}$ molecules/mol.
$1.8\times {10}^{24}$ atoms corresponds to
$\frac{1.8\times {10}^{24}}{6.02\times {10}^{23}}\simeq 3$ moles of atoms.
1 molecule of $C{O}_2$ corresponds to 3 atoms.
Hence, 3 moles of atoms will represent 1 mole of $C{O}_2$ molecules.