How many moles and atoms of sodium are in the recommended daily allowance?

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