How do you calculate enthalpy change of combustion?
You usually calculate the enthalpy change of combustion from enthalpies of formation.
The standard enthalpy of combustion is
It is the heat evolved when 1 mol of a substance burns completely in oxygen at standard conditions. For example,
For each product, you multiply its
Do the same for the reactants. Subtract the reactant sum from the product sum.
Use the following enthalpies of formation to calculate the standard enthalpy of combustion of acetylene,
The heat of combustion of acetylene is -1309.5 kJ/mol.
Here is a video that discusses how to calculate the enthalpy change when 0.13 g of butane is burned.
Video from: Noel Pauller