The molar mass of pentane (C5H12) is approximately 72.15 g/mol. This value is derived from the sum of the atomic masses of all the atoms in a single molecule of pentane.
To calculate the molar mass, we consider the molecular formula of pentane, which has 5 carbon (C) atoms and 12 hydrogen (H) atoms. The atomic mass of carbon is about 12.01 g/mol, and for hydrogen, it’s roughly 1.008 g/mol. So, the calculation is as follows:
- For carbon: 5 atoms × 12.01 g/mol = 60.05 g/mol
- For hydrogen: 12 atoms × 1.008 g/mol = 12.096 g/mol
Adding these together gives us:
60.05 g/mol + 12.096 g/mol ≈ 72.15 g/mol
Therefore, the molar mass of pentane is approximately 72.15 g/mol.