Calculate the Molecular Weight of H2O

The molecular weight of water (H₂O) can be calculated by adding together the atomic weights of its constituent atoms. Water consists of two hydrogen (H) atoms and one oxygen (O) atom.

1. The atomic weight of hydrogen (H) is approximately 1.01 g/mol.

2. The atomic weight of oxygen (O) is approximately 16.00 g/mol.

Now, we can calculate the molecular weight of H₂O:

• Weight from hydrogen: 2 × 1.01 g/mol = 2.02 g/mol
• Weight from oxygen: 1 × 16.00 g/mol = 16.00 g/mol

Adding these together gives:

2.02 g/mol + 16.00 g/mol = 18.02 g/mol

Therefore, the molecular weight of H₂O is approximately 18.02 g/mol.