Which of the following statements is/are correct? (i) One mole of sodium atoms contains \(6.02 \times 10^{23}\) atoms and weight \(23 \mathrm{~g}\) (ii) One mole of magnesium atoms contains \(6.02\) \(\times 10^{23}\) atoms and weighs \(24 \mathrm{~g}\) (iii) One mole of oxygen atoms contains \(6.02 \mathrm{x}\) \(10^{23}\) atoms and weighs \(16 \mathrm{~g}\)
A. I and II B. II and III C. I and III D. I, II and III
Correct Answer: D
Explanation
One mole of any element is the amount that contains the Avogadro number of particles i.e. \(6.02 \times 10^{23}\) particles - One mole of sodium atoms contains \(6.02 \times 10^{23}\) atoms and weighs \(-23 \mathrm{~g}\) - one mole of magnesium atoms contains \(6.02\) \(\times 10^{23}\) magnessium atoms \(-24 \mathrm{~g}\) - One mole of oxygen atoms contains \(6.02 \times 10^{23}\) atoms of oxygen atoms \(-16 \mathrm{~g}\) What is your take on the last sentence? Were you expecting one mole of oxygen atoms to weigh \(32 \mathrm{~g}\) because of the diatomicity of the element? NO! The statement says oxygen atom and not just oxygen.
