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  4. The number of atoms in 52 g of He is

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Q. The number of atoms in 52 g of He is

AIIMSAIIMS 2014Some Basic Concepts of Chemistry

Solution:

Number of atoms $=\frac{N_{A}\times mass}{At. mass}$
$=\frac{6.023\times10^{23}\times52}{4}=7.829\times10^{24} $atoms