Question

no. of gram atoms in 46g of Na

Answer 1

No. of gram atom means no. of moles
No. of moles = given mass / molar mass
= 46 /23 = 2
No. of gram atoms = 2

Hope it will help you

Answer 2

One gram contains avagadro number of atoms..
46 grams contains...46×avagadro number..
That is...46×6×10 power 23
276×10 power 23 number of atoms