When a balanced chemical equation not only indicates the quantities of the different reactants and products but also indicates the amount of heat evolved or absorbed, it is called thermochemical equation. Fractional coefficients may be used in writing a thermochemical equation. H2 ( g ) + ½ O2 ( g ) ---------> H2O ( l ) +285.8 KJ mol-1 H2 ( g ) + ½ O2 ( g ) … [Read more...] about Thermochemical Equation