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

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current