0.0152 mol; 5.24 x 10^22 atoms
The RDA for sodium is 2300 mg or 2.3 g.
a) Moles of Na
The molar mass of Na is 22.99 g/mol.
Moles of Na = 2.00 g Na × (1 mol Na/22.99 g Na) = 0.0870 mol Na
b) Atoms of Na
Atoms of Na = 0.0870 mol Na x (6.022 × 10^23 atoms Na/1 mol Na)
= 5.24 x 10^22 atoms Na