Question Detail
Question
Calculate the number of oxygen atoms in 0.520 mol of CaCO₃
Correct Answer
Option A is the correct answer.
Detailed Explanation
1 mol CaCO₃ contains 3 mol O atoms. 0.520 mol CaCO₃ contains 0.520 × 3 = 1.56 mol O atoms. Number of O atoms = 1.56 × 6.022 × 10²³ = 9.394 × 10²³. None of the options match this. Possibly the question meant 0.520 mol of oxygen atoms? If so, 0.520 × 6.022×10²³ = 3.13×10²³ ≈ 3.343×10²³? This seems inconsistent.
Hint
Multiply moles of compound by the number of O atoms per formula unit, then by Avogadro's number.