heat of combustion?

Answer 1

Ignite a substance in a pure oxygen atmosphere in container submersed in a water filled calorimeter. Maintain combustion until all of the substance is consumed. The heat absorbed by water and calorimeter is the heat of combustion.
Q- teat
C- specific heat capacity
T - temperature ( usually in degrees Kelvin)
Q( of combustion) = Q(loss) + Q(water) +Q(calorimeter) + Q(container)

Q(loss) - experimentally determined and usually very small.
Q(water)=C(water) (T2-T1)
T1 - initial temperature
T2 - final maximum temperature.
similarly fro container and calorimeter.