Final answer:
Alkanes and cycloalkanes are represented by the formulas CnH2n+2 and CnH2n, respectively. Alkanes have only single bonds and a saturated hydrocarbon formula, while cycloalkanes have a ring structure with two fewer hydrogen atoms.
Step-by-step explanation:
The formulas CnH2n+2 and CnH2n represent general formulas for alkanes and cycloalkanes, respectively. In organic chemistry, alkanes are hydrocarbons with single bonds only and follow the general formula CnH2n+2, whereas cycloalkanes are alkanes in which the carbon atoms are connected in a ring, or cyclic, structure. Cycloalkanes have two fewer hydrogen atoms than acyclic alkanes, following the general formula CnH2n.
To write the molecular formulas for cycloalkanes, one would need to identify the number of carbon atoms (n) in the ring and apply the CnH2n formula. For example, cyclopentane, which has five carbon atoms in the ring, would have a molecular formula of C5H10.