Q75 / 200 · NEET 2024 (Re-NEET) · Chemistry

1.0 g of $\mathrm{H}_2$ has same number of molecules as in:

  • Correct answer
    A
    14 g of $\mathrm{N}_2$
  • B
    18 g of $\mathrm{H}_2 \mathrm{O}$
  • C
    16 g of CO
  • D
    28 g of $\mathrm{N}_2$

Solution

Number of moles of $\mathrm{H}_2=\frac{1}{2}=0.5$ Number of molecules of $\mathrm{H}_2=0.5 \mathrm{~N}_{\mathrm{A}}$. (1) Number of moles of $\mathrm{N}_2=\frac{14}{28}=0.5$ Number of molecules of $\mathrm{N}_2=0.5 \mathrm{~N}_{\mathrm{A}}$ (2) Number of moles of $\mathrm{H}_2 \mathrm{O}=\frac{18}{18}=1$ Number of molecules of $\mathrm{H}_2 \mathrm{O}=1 \times \mathrm{N}_{\mathrm{A}}=\mathrm{N}_{\mathrm{A}}$ (3) Number of moles of $\mathrm{CO}=\frac{16}{28}=\frac{4}{7}$ Number of molecules of $\mathrm{CO}=\frac{4}{7} \mathrm{~N}_{\mathrm{A}}$ (4) Number of moles of $\mathrm{N}_2=\frac{28}{28}=1$ Number of molecules of $\mathrm{N}_2=1 \times \mathrm{N}_{\mathrm{A}}=\mathrm{N}_{\mathrm{A}}$

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

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