Question

What is the molecular mass of toluene?

Answer 1

Step1. Molecular mass

• Molecular mass or molecular weight is the mass of a molecule.
• It is calculated as the sum of the atomic mass of each constituent element multiplied by the number of atoms of that element in the molecular formula.

Step2. Molecular Formula for toluene

• The molecular formula of toluene is ${\mathrm{C}}_7{\mathrm{H}}_8$
• The molecular mass of ${\mathrm{C}}_7{\mathrm{H}}_8$=$\text{7×The atomic mass of C+ 8×The atomic mass of H}$

Step2. Calculation of molecular mass of ${\mathrm{C}}_7{\mathrm{H}}_8$

The molecular mass of ${\mathrm{C}}_7{\mathrm{H}}_8$=$\left(\text{7×12.01+ 8×1.008}\right)\text{u}$

=$92.134\text{u}$

Hence, the molecular mass of toluene is $92.134\text{u}$.