(i) calculation of enthalpies of reactions hess's law makes it possible to calculate enthalpies of many reactions whic experimentally. for example, it is diffic

(i) Calculation of Enthalpies of Reactions Hess's law makes it Possible to calculate enthalpies of many reactions whic experimentally. for example, It is difficult to measure the heat evolved when carbon burns in oxygen to C(S)+0,(o)CO(g) AH = ? 2 from Hess's law, however, it is known that the heat evolved in the Com Carbondioxide is the same, viz, 393.5 kJ, whether the reaction takes place in a C(S)+O,(g) CO(g) AH 393.5 kJ or in two steps are Cs)+0,(9) CO(g) AH X kJ (say) cO(g)+O,(g) Co,(g) AH = y kJ (say) according to Hess's law AH X + y or X +y =-393.5 kJ Contact Us: Website www.eduncle.com Email: support@eduncle.com Call Toll Free