Question

how many atoms and g atoms are there in 4.6 g Na?

Answer 1

Molar mass of sodium = 23 g
Number of atoms in 23 g of sodium = 6.022$\times$10²³ atoms
Number of atoms in 4.6 g of sodium = $\frac{6.022\times {10}^{23}}{23}\times 4.6=1.20\times {10}^{23}atoms$
Gram atom is defined as that mass of an element which is numerically equal to atomic mass of the element and is expressed in grams. One gram atom is equal to the gram atomic weight of an element.
1 gram atom of sodium = Gram atomic weight of sodium = 23 g