What is the mass fraction of carbon in cycloparaffins?

Cycloparaffins are saturated hydrocarbons with the general formula CnH2n. They are isomers of alkenes, but they do not have a multiple bond, since the molecules have a cyclic structure and, in terms of properties, they more resemble alkanes.
w – mass fraction of an element in a substance is calculated by the formula:
w = Ar * n / Mr * 100%,
where Ar is the relative atomic mass of an element, n is the number of atoms of a given element, Mr is the relative molecular weight.
Mr (СnН2n) = 12n + 2n = 14n, then w (С) = 12n / 14n * 100% = 85.7%.