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Question

What is the molecular mass of glucose molecule (C6H12O6)?


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Solution

Step1. Molecular Mass

  • Molecular mass is the sum of atomic mass, 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. Formula for molecular mass of glucose molecule (C6H12O6)

  • The molecular mass of C6H12O6=6×TheatomicmassofC+12×TheatomicmassofH+6×AtomicmassofO

Step3. Calculation of molecular mass of glucose molecule

The molecular mass of glucose(C6H12O6)= 6×12.01+12×1.0079+6×16u

=72.06+12.0948+96u

=180.1548u

180u

Hence, the molecular mass of glucose molecule is 180u.


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