# What is the general formula of an alkane?

${C}_{n} {H}_{2 n + 2}$.
${C}_{n} {H}_{2 n + 2}$ is the generic alkane.........
Try it out.........$\text{methane, C=1}$,............$\text{decane, C=10}$
With respect to this formula, it is often useful to calculate the degree of unsaturation possessed by any given organic formula. Once you calculate this, for a specified formula you can predict how many unsaturated bonds, $C = O$, $C = C$, $C = N$, how many ring junctions etc. a given formula is likely to possess.