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The highest number of helium atoms is in
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4 mol of helium
(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
(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
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