This diagram represents the fractional distillation of petroleum. The crude oil

Question

This diagram represents the fractional distillation of petroleum. The crude oil is heated in a furnace until vaporization then passed into a distillation tower to separate the individual components. Answer the following questions regarding petroleum distilllation using this diagram. The number of carbons in a given component is shown in parenthesis. Which component has the highest boiling point? Which component is found in location A? Which component is found in location C? Rank these compounds by boiling point. Write and balance the equation for the complete combustion of ethane, C_2H_6. You do not need to include any phase symbols or energy changes. Write and balance the equation for the complete combustion of heptane, C_7H_16. You do not need to include any phase symbols or energy changes.

Explanation / Answer

Highest boiling point --> Asphalt since it is the bottom product

Location A is essentially light gases --> C-1-4 gases

Location C is once again, aspahlt

Rank boiling points:

propane < pentane < hexane

Combustion of ethane

C2H6 + O2 --> CO2 + H2O

balance

C2H6 + 7/2O2 --> 2CO2 + 3H2O

For heptane

C7H16 + O2---> CO2 + H2O

balance

C7H16 + 11O2---> 7CO2 + 8H2O

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