The enthalpy of combustion of the samples agree with the previous
reports except for the sample GA. The reason for this deviation is not
clear. The enthalpy of formation \(({H}_{f}^{o})\) for each sample was
calculated using standard heat of formation\({H}_{f}^{o}\left(\text{CO}_{2(g)}\right)=\ -393.51\ kJ/mol\) and\({H}_{f}^{o}\left(H_{2}O_{(l)}\right)=\ -285.83\ kJ/mol\)[24], according to the reactions (5),
(6) and (7).
The accuracy of these values \(({H}_{f}^{o})\) is a function of the
validity of the molecular formula of the carbohydrate used to represent
the B. vulgaris agro-waste which has a direct influence on the
accuracy of the heat determination. Environmental factors such as
temperature, pH, substrate concentration and presence of toxins have
been used extensively to elucidate the feasibility of microbial
degradation. Estimation of physical property such as heat capacity and
heat of formation will further ascertain the veracity of microorganism
in environmental engineering application.