Question

Which will contain more number of atoms 5g of sodium or 5g of hydrogen.

Answer 1

5g of hydrogen since the mass of hydrogen is less than sodium therefore the number of atoms is higher in hydrogen
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Answer 2

First find out the number of moles in each case.
for sodium number of moles= weight/molecular mass
=5/23=0.21
fir hydrogen number of moles=weight/molecular mass
=5/1=5
so clearly 5g of hydrogen is the answer