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Calculate the number of atoms in 100amu of He

It's just a technique of unitary method
mass of one mole of he is 4 amu.
therefore, 100 amu. has 100/4 = 25 atoms


Since mass of one atom of He = 4a.m.u
Therefore 100 a.m.u no. of He atom will be 100/4=25 
1 5 1
The number of atoms in 100 amu of helium is 25
1 5 1
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