Question Detail
Question
How many moles does 1.23 × 10²³ molecules of CaCl₂ represent?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Avogadro's number = 6.022 × 10²³ molecules/mol. Moles = (1.23 × 10²³) / (6.022 × 10²³) = 0.204 mol ≈ 0.2 mol.
Hint
Moles = number of particles / Avogadro's number.