Q9 / 155 · WBJEE 2023 · Chemistry

Arrange the following in order of increasing mass I. 1 mole of \(\mathrm{N}_2\) II. \(0.5 \mathrm{~mole}^2\) of \(\mathrm{O}_3\) III. \(3.011 \times 10^{23} \mathrm{molecules}\) of \(\mathrm{O}_2\) IV. 0.5 gram atom of \(\mathrm{O}_2\)

  • Correct answer
    A
    IV \( < \) III \( < \) II \( < \) I
  • B
    IV \( < \) I \( < \) III \( < \) II
  • C
    III \( < \) II \( < \) IV \( < \) I
  • D
    I \( < \) III \( < \) II \( < \) IV

Solution

Hint : 1 mole \(\mathrm{N}_2=28 \mathrm{~g}\) \(0.5 \mathrm{~mole} \mathrm{O}_3=24 \mathrm{~g}\) \(3.011 \times 10^{23}\) molecules of \(\mathrm{O}_2=1 / 2\) mole \(\mathrm{O}_2=1\) mole \(\mathrm{O}=16 \mathrm{~g}\) \(0.5 \mathrm{~g}\) atom \(\mathrm{O}_2=1 / 2\) mole of atoms of \(\mathrm{O}=8 \mathrm{~g}\)

Hence, the correct answer is option: 'A'.

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