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According to WolframAlpha, the change in enthalphy in the combustion of propane is -2220 kJ/mol. How do I calculate the activation energy required start the reaction in the first place? Do you use the same principles as when calculating delta H or am I missing something mind bogglingly obvious?

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http://www.engineeringtoolbox.com/fuels-ignition-temperatures-d_171.html

The autoignition temperature is an external variable. It depends upon total pressure and oxygen partial pressure. For paper it is famously 232.778 C (significant figures aside).

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