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Crude oil may contain hundreds of different types of hydrocarbons. Some examples include:

  • Butane $\left( C _4 H _{10}\right)$
  • Dodecane $\left( C _{12} H _{26}\right)$
  • Octane $\left( C _8 H _{18}\right)$
  • Benzene ( $C _6 H _6$ )



Many common fuels, such as gasoline and kerosene, are combinations of these substances or others. When these fuels burn, they combine with oxygen $\left( O _2\right)$ to produce carbon dioxide $\left( CO _2\right)$ and water ( $H _2 O$ ).



Identify each of the highlighted materials as an element, a compound, or a mixture, and explain your reasoning.