What is the mass percent of sodium in nacl?
a)39.34%
b)60.66%
c)60.66%
d)78.68%

Explanation:

Molecular mass of NaCl = 58.44g/mol

Molecular mass of Na = 22.98g/mol

Molecular mass of Cl = 35.5g/mol

To find the percentage mass of Na in NaCl we divide the molecular mass of Na by the total number of atoms of Na present in the compound which in this case is 1 by the molecular mass of the compound

%Na = molecular mass of Na / molecular mass of compound.

%Na =( 22.98 / 58.44 ) * 100

% Na = 0.3932 * 100 = 39.32%

The mass percent of Na present in NaCl is 39.32%