Q65 / 200 · NEET 2024 · Chemistry

The highest number of helium atoms is in

  • A
    4 u of helium
  • B
    4 g of helium
  • C
    2.271098 L of helium at STP
  • Correct answer
    D
    4 mol of helium

Solution

(1) $4 u$ of $\mathrm{He}=\frac{4 u}{4 u}=1 \mathrm{He}$ atom (2) 4 g of Helium $=\frac{4 \mathrm{~g}}{4 \mathrm{~g}}$ mole $=1$ mole $=\mathrm{N}_{\mathrm{A}} \mathrm{He}$ atom (3) $\begin{aligned} 2.2710982 \text { of He at STP } & =\frac{2.271}{22.710982} \text { mole } \\ & =0.1 \mathrm{~mole} \\ & =0.1 \mathrm{~N}_{\mathrm{A}} \mathrm{He} \text { atom } \end{aligned}$ (4) 4 mol of $\mathrm{He}=4 \mathrm{~N}_{\mathrm{A}} \mathrm{He}$ atoms

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

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