The molecular mass of glucose (C₆H₁₂O₆) molecule is approximately 180.15 atomic mass units (u).

Here’s how to calculate it:

1. Find the atomic masses of each element:
   • Carbon (C): 12.01 u (from the periodic table)
   • Hydrogen (H): 1.008 u (from the periodic table)
   • Oxygen (O): 15.999 u (from the periodic table)
2. Multiply the atomic mass of each element by the number of atoms in the molecule:
   • Carbon: 12.01 u/atom * 6 atoms = 72.06 u
   • Hydrogen: 1.008 u/atom * 12 atoms = 12.096 u
   • Oxygen: 15.999 u/atom * 6 atoms = 95.994 u
3. Add the masses of all the elements to find the total molecular mass: Total molecular mass = 72.06 u + 12.096 u + 95.994 u = 180.15 u

Therefore, the molecular mass of a glucose molecule is approximately 180.15 atomic mass units.