Alkanes General formula:CH2n+2 Found in everything from natural gas to petroleum. The smaller alkanes have very low boiling points (b.p.)therefore they are gases. CH4 C2H6 C3Hg b.p.-160C -89C -42C Chapter 3 3Chapter 3 3 Alkanes • General formula: CnH2n+2 • Found in everything from natural gas to petroleum. • The smaller alkanes have very low boiling points (b.p.) therefore they are gases. CH4 C2H6 C3H8 b.p. -160oC -89oC -42oC