Home › MCQs › ECAT Chemistry › Question #790
Back to Questions
ECAT Chemistry QUESTION #790
Question 1
Molarity of heavy water \((\text{D}_2\text{O})\):
  • 55.5 mol dm\(^{-3}\)
  • 60.5 mol dm\(^{-3}\)
  • 40.5 mol dm\(^{-3}\)
  • 50.5 mol dm\(^{-3}\)✔️
Correct Answer Explanation
Molarity of heavy water \(= \dfrac{\text{density} \times 1000}{\text{molar mass}} = \dfrac{1.105 \times 1000}{20} \approx 55.5\) mol dm\(^{-3}\). Note: The paper marks 50.5 but the accepted value is ~55.5.