The molar mass of naphthalene, a polycyclic aromatic hydrocarbon with the chemical formula C10H8, is calculated by summing the atomic masses of all the atoms in its molecular formula. Each carbon atom has an atomic mass of approximately 12.01 g/mol, and each hydrogen atom has an atomic mass of about 1.01 g/mol.
For naphthalene:
- Carbon: 10 atoms × 12.01 g/mol = 120.1 g/mol
- Hydrogen: 8 atoms × 1.01 g/mol = 8.08 g/mol
Adding these together gives:
120.1 g/mol + 8.08 g/mol = 128.18 g/mol
Therefore, the molar mass of naphthalene is approximately 128.18 g/mol.