Hydrocarbons

• Homologous Series: Alkane with the same functional group and same number of carbon atoms
• The general formula for alkanes is CnH2n+2.
• Molecular Formula in Alkane:

  1. CH4
  2. C2H6
  3. C3H8
• The general formula of Alkene is CnH2n.
• Ethylene (ethene) - C2H4
• Propylene (propene) - C3H6
• Methylane (methane) - CH4
• Ethylane (ethane) - C2H4
• Propane - C3H8
• Boiling Point of methane is -161.5 degrees celsius
• Boiling Point of ethane is -89 degrees celsius
• Boiling Point of propane is -42 degrees celsius
• Boiling Point of ethene is -103.7 degrees celsius
• Boiling Point of propene is -47.6 degrees celsius
• All hydrocarbons has a negative bp.
• Mr of Carbon is 12
• Mr of Hydrogen is 1
• The larger the molecular mass, the higher the boiling point.
• Products formed when alkanes and alkenes are completely burnt in oxygen are carbon dioxide (CO2) and water vapour (2H2O).
• Product of an incomplete combustion: Carbon monoxide (CO) and water (H20) and carbon (C).