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Why the temperature of air acetylene flame is smaller then that of air oxygen flame?
Accepted Answer
The temperature of an air-acetylene flame is lower than that of an air-oxygen flame because acetylene (C2H2) has a lower heat of combustion than oxygen (O2). The heat of combustion is the amount of heat released when a fuel is burned completely in oxygen. Acetylene has a heat of combustion of 12,551 kJ/mol, while oxygen has a heat of combustion of 131 kJ/mol. This means that when acetylene is burned in air, less heat is released than when oxygen is burned in air. The lower heat of combustion of acetylene results in a lower flame temperature.
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