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Question

What is the molecular weight of NaOH?


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Solution

Step1. Molecular weight

  • Molecular weight is the sum of atomic weight, measured in amu.
  • The mass of one carbon atom is equal to the atomic mass unit (formerly abbreviated as 'amu,' but now spelled as 'u' – unified mass) according to the latest IUPAC recommendation.

Step2. The formula for the molecular weight of NaOH

The molecular weight of NaOH=TheatomicweightofNa+TheatomicweightofO+TheatomicweightofH

Step3. Calculation of molecular weight of NaOH

The molecular weight of NaOH

=22.990+15.999+1.008u=39.997u40u

Hence, the molecular weight of NaOH is 40u.


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