Glucose has a gram molecular mass of

The calculation is as follows:
Six atoms of carbon: 6 ×12.01g=72.06g

Twelve atoms of hydrogen: 12 ×1.008g=12.096g

Six atoms of oxygen: 6 ×16.00g=96.00g

So the molar mass of C₆​H₁₂​O₆​ is 72.06g+12.096g+96.00g=180.096g

The gram molecular mass of glucose is 180.096g 

Hence , the Glucose molecular mass is 180.0096g.