The C10H20 or Carbon10Hydrogen20 is an alkene. We have Alkane, Alkene, and Alkyne. Alkane is the complete among these. Alkane can be composed of 10 Carbons and 22 Hydrogen. Alkyne can be composed of 10 Carbons and 18 Hydrogens. And Alkene can be composed of 10 Carbons and 20 Hydrogens.