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Number of atoms of He in 100 amu of He(atomic wt. of He is 4) are:
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The correct answer is:
25
$\begin{array}{l}
100 \text { amu of He }=\frac{100}{4} \text { atoms of He } \\
=25 \text { atoms. }
\end{array}$
$[1$ a.m.u. $=$ mass of one proton (approx.)]
100 \text { amu of He }=\frac{100}{4} \text { atoms of He } \\
=25 \text { atoms. }
\end{array}$
$[1$ a.m.u. $=$ mass of one proton (approx.)]
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