Question

# What is the molecular mass of glucose molecule $\left({\mathrm{C}}_{6}{\mathrm{H}}_{12}{\mathrm{O}}_{6}\right)$?

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Solution

## Step1. Molecular MassMolecular 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 $\left({\mathrm{C}}_{6}{\mathrm{H}}_{12}{\mathrm{O}}_{6}\right)$The molecular mass of ${\mathrm{C}}_{6}{\mathrm{H}}_{12}{\mathrm{O}}_{6}$=$\text{6×TheatomicmassofC+12×}\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\text{H+6×AtomicmassofO}$Step3. Calculation of molecular mass of glucose moleculeThe molecular mass of glucose$\left({\mathrm{C}}_{6}{\mathrm{H}}_{12}{\mathrm{O}}_{6}\right)$= $\left(\text{6×12.01+12×1.0079+6×16}\right)\text{u}$ =$\left(72.06+12.0948+96\right)\text{u}$ =$180.1548\text{u}$ $\simeq 180\text{u}$ Hence, the molecular mass of glucose molecule is $180\text{u}$.

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