1 g of hydrogen contain 6×10power23 atoms. The atomic mass of helium is 4u. It follows that no of atom in 1 g of He.
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no. of atoms in 4g=6.022X10^23 atoms
no of atoms in 1 g=6.022X10-23/4 atoms
=1.5055X10^23 atoms
no of atoms in 1 g=6.022X10-23/4 atoms
=1.5055X10^23 atoms
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