Here's why:
* Eicosane is an alkane, a type of hydrocarbon with only single bonds between carbon atoms.
* Alkanes follow a general formula of CₙH₂ₙ₊₂, where 'n' represents the number of carbon atoms.
* With 20 carbon atoms (n = 20), the formula becomes C₂₀H₄₂ (20 x 2 + 2 = 42).
