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QUESTION

# How do you write chemical equations for combustion reactions?

The combustion of octane C_8H_18 follows this reaction 2C_8H_18 + 25O_2 -> 16CO_2 + 18H_2O

A combustion reaction takes a hydrocarbon and burns it in oxygen to release carbon dioxide and water. A hydrocarbon is a molecule that contains carbon and hydrogen.

The basic equation looks like this.

The combustion of propane C_3H_8 follows this reaction

C_3H_8 + 5O_2 -> 3CO_2 + 4H_2O

The combustion of pentane C_5H_12 follows this reaction

C_5H_12 + 8O_2 -> 5CO_2 + 6H_2O

The combustion of octane C_8H_18 follows this reaction

2C_8H_18 + 25O_2 -> 16CO_2 + 18H_2O