Respuesta :
Explanation:
Formula mass of a compound is calculated by taking the sum of atomic masses of all the elements present in the compound.
Since, atomic mass of Na = 23 g/mol
Atomic mass of S = 32 g/mol
Atomic mass of O = 16 g/mol
Hence, formula mass of [tex]Na_{2}SO_{4}[/tex] will be as follows.
Formula mass = [tex](2 \times 23 g/mol) + 32 g/mol + (4 \times 16 g/mol)[/tex]
= 142 g/mol
Thus, we can conclude that formula mass of [tex]Na_{2}SO_{4}[/tex] is 142 g/mol.
