STANDARD ENTHALPY OF FORMATION

Standard Enthalpy Change of Formation ,Combustion and Neutralisation | Hess's law

Find the value of Delta_(f) H^(@) for the reaction N_(2) O_(4) (g) + 3 CO(g) rarr N_(2) O (g) + 3 CO_(2) (g) Standard enthalpies of formation of CO(g), CI_(2) (g), N_(2) O (g) , and N_(2) O_(4) (g) are - 110, - 393, 81 , and 9.7 kJ mol^(-1) , respectively. Strategy : The standard enthalpy change of a reaction is equal to the sum of the standard molar enthalpie of formation of the products each miltiplied by its stiochiometric coefficient in the balanced equation, minus the corresponding sum of the standard molar enthalpies of formation of the reactants

Standard enthalpies of formation of O_3,CO_2,NH_3 and HI are 142.2 , - 393.2, -46.2 and +25.9 "kJmol"^(-1) respectively . The order of their increasing stabilities will be

The standard enthalpies of formation of CO_(2)(g) and HCOOH (l) are -393.7 kJ"mol"^(-1) and -409.2 kJ"mol"^(-1) respectively. Which of the following statements are correct?

Standard enthalpies of formation of O_(3),CO_(3),NH_(3) and HI are 142.2,-383.2,-46.2 and +25.9kJ mol^(-1) respectively. The order of their increasing stabilities will be:

The standard enthalpies of formation of SF_(6)(g) , S(g) and F(g) are -1150 , +280 and +85KJmol^(-1) . Thus, average bond energy of (S-F) in SF_(6) is