The energy evolves in the combustion of acetylene is calculated by the use of standard enthalpy of combustion of the reactant.
Combustion reaction is the reaction in which the substance react with oxygen gas releasing energy in the form of light or heat.The two main ingredient present in the combustion reaction is oxygen and heat.
The reaction for the combustion of acetylene when burned in presence of oxygen is
2C2H2 + 5O2 ---> 4CO2 + 2H2O
This is a balanced chemical reaction for combustion of acetylene. Here given 35.58g of C2H2 is burned in excess oxygen.so,
35.58g of C2H2 . 1 mol /26g = 1.368 mole
26g is the molar mass of the acetylene.
1.368 mol C2H2 . 5 moles of O2 /2 moles of C2H2 = 3.42 moles of O2 used.
To calculate the heat evolved in the combustion process can be obtained by dividing the energy given by 3.42 moles of O2.
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