Calculate the enthalpy of formationn of carbon disulphidegiven that the enthalpy of combustion of carbon disulphide is110.2 kJ mol^(-1) and thoseof sulphur and carbon are 297.4 kJ and 394.5 kJ // g atom respectively.

Calculate the enthalpy of formationn of carbon disulphidegiven that th

1.	Calculate the enthalpy of formationn of carbon disulphidegiven that the enthalpy of combustion of carbon disulphide is110.2 kJ mol^(-1) and thoseof sulphur and carbon are 297.4 kJ and 394.5 kJ // g atom respectively.
Answer» Solution :Aim `: C(s)+ 2S(s) rarr CS_(2)(l), DeltaH = ?` GIVEN `: (i) CS_(2)(l) + 3O_(2)(G) rarr CO_(2)(g) + 2SO_(2)(g), DELTA H- 110.2 kJ mol^(-1)` (ii)`S(s) + O_(2)(g) rarr SO_(2)(g) , Delta H= - 297.4 kJ mol^(-1)` (iii) `C(s)+O_(2)(g) rarrCO_(2)(g), Delta H =- 394.5 kJ mol^(-1)` Eqn. (iii) ` +2 xx ` Eqn. (ii) - Eqn. (i) gives the required result.