The molecular weight of propane (C3H8) is calculated by adding the atomic weights of all the atoms in the molecule. Propane consists of 3 carbon atoms and 8 hydrogen atoms.
The atomic weight of carbon (C) is approximately 12.01, and the atomic weight of hydrogen (H) is approximately 1.01. Therefore, the molecular weight of propane can be calculated as follows:
Molecular weight of C3H8 = (3 × 12.01) + (8 × 1.01)
Molecular weight of C3H8 = 36.03 + 8.08
Molecular weight of C3H8 = 44.11
So, the molecular weight of propane (C3H8) is approximately 44.11 g/mol.