Considering the definition of molar mass, the molar mass of NaOH is 40 g/mole.
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
In this case, you know the molar mass of the elements is:
So, the molar mass of the compound NaOH is calculated as:
NaOH= 1× 23 g/mole + + 1× 16 g/mole + 1× 1 g/mole
Solving:
NaOH= 40 g/mole
Finally, the molar mass of NaOH is 40 g/mole.
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