Answer:
58.44 g/mol.
Step-by-step explanation:
The molar mass of Na is 22.99 g/mol.
The molar mass of Cl is 35.45 g/mol.
Because you have 1 mole of Na and 1 mole of Cl, the total molar mass looks like this:
(# of moles for substance 1 * molar mass of substance 1) +
(# of moles for substance 2 * molar mass of substance 2) = total molar mass of compound
(1*22.99)+(1*35.45) = 58.44 g/mol.