How many magnesium atoms are present in 1.00 mole of MgO?

• A. 6.022 × 10^{23} atoms
• B. 1.00 × 10^{24} atoms
• C. 3.011 × 10^{23} atoms
• D. 1.00 × 10^{23} atoms

Answer: (A)

Verified step by step guidance

1. Understand that 1 mole of any substance contains Avogadro's number of entities, which is \$6.022 \times 10^{23}$.
2. Recognize that magnesium oxide (MgO) is composed of one magnesium atom and one oxygen atom per formula unit.
3. Since the problem asks for the number of magnesium atoms in 1.00 mole of MgO, note that each mole of MgO contains exactly 1 mole of magnesium atoms.
4. Use Avogadro's number to convert moles of magnesium atoms to number of atoms: multiply 1.00 mole by \$6.022 \times 10^{23}$ atoms/mole.
5. Conclude that the number of magnesium atoms in 1.00 mole of MgO is equal to Avogadro's number, \$6.022 \times 10^{23}$ atoms.