The molar mass of C8H18, which is commonly known as octane, is calculated by adding the atomic masses of all the atoms present in the molecular formula.
Octane consists of 8 carbon (C) atoms and 18 hydrogen (H) atoms. The atomic mass of carbon is approximately 12.01 g/mol, and for hydrogen, it is about 1.008 g/mol.
To find the molar mass of C8H18, we perform the following calculations:
- 8 Carbon atoms: 8 × 12.01 g/mol = 96.08 g/mol
- 18 Hydrogen atoms: 18 × 1.008 g/mol = 18.144 g/mol
Now, we add these two results together:
96.08 g/mol + 18.144 g/mol = 114.224 g/mol
Therefore, the molar mass of C8H18 is approximately 114.22 g/mol.