Question

Calculate the molecular mass of Ethane (${\mathrm{C}}_2{\mathrm{H}}_{6_{}}$).

Answer 1

• The molecular mass of the substance is the sum of atomic masses of all atoms in a molecule of the substance.
• The molecular mass of ${\mathrm{C}}_2{\mathrm{H}}_{6_{}}$=$$\begin{gathered} (2\times AtomicmassofCarbon)+(6\times AtomicmassofHydrogen) \\ =(2\times 12)+(6\times 1) \\ =30u \end{gathered}$$