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The molar mass is generally expressed in grams or gram/mol

To calculate the molar mass of NaOH, first you need to know about the molecular weight of the NaOH. to be able to do that , first find the atomic weight of the Na, O, and H from the periodic table.

Atomic weight of Na 22.98976928,

Hydrogen’s standard atomic weight is 1

oxygen has a standard atomic weight of 15.9994.

Add the atomic weight of all 3 which will be 39.9892

So, the molar mass of NaOH is 39.9892 gm/mol.