Q66 / 200 · NEET 2002 · Chemistry

Which has the maximum molecules?

  • A
    $7 g \mathrm{~N}_2$
  • Correct answer
    B
    $2 \mathrm{H}_2$
  • C
    $16 \mathrm{~g} \mathrm{NO}_2$
  • D
    $16 \mathrm{O}_2$

Solution

no. of moles = mass of molecule/ molecular weight. $7 g \mathrm{~N}_2 \rightarrow \frac{7}{28}=0.25$ moles $2 \mathrm{~g} \mathrm{H}_2 \rightarrow \frac{2}{2}=1$ mole $16 \mathrm{~g} \mathrm{NO}_2 \rightarrow \frac{16}{46}=0.347 \mathrm{moles}$ $16 \mathrm{~g} \mathrm{O}_2 \rightarrow \frac{16}{32}=0.5$ moles

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

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