The molar mass of beryllium oxide (BeO) is the sum of the atomic masses of beryllium (Be) and oxygen (O). The atomic mass of beryllium is approximately 9.0122 atomic mass units (amu), while the atomic mass of oxygen is approximately 15.9994 amu.

Therefore, the molar mass of beryllium oxide is:

BeO molar mass = (1 × 9.0122 amu for Be) + (1 × 15.9994 amu for O) ≈ 24.9996 amu

The molar mass of beryllium oxide is approximately 24.9996 atomic mass units.