Calculate the enthalpy of sublimation of Na metal from the following data given `Delta H_fus^@=2.6 KJ mol^(-1)`
`Delta H_vap^@=98 KJ mol^(-1)`

Calculate the electronegativity of fluorine from the following data E_H-H=104.2Kcal mol^(-1) , E_F-F=36.6 Kcal mol^(-1) , E_H-F=134.6 Kcal mol^)-1)

Calculate the resonance energy of N_2O from the following data Delta_1 H^0 of N_2O = 82 kJ mol^(-1) for the reaction N_2(g) + 1/2 O_2 (g) rarr N_2O (g) Bond energy of N=N, N=N, O=O and N=0 bonds are 946,418,498 and 607 kJ mol^(-1) respectively.

Calculate the bond energy of O-H bond in H_(2)O(g) at the standard state from the following data: (1) H_(2)(g) to 2H(g),DeltaH^(0)=436kJ*mol^(-1) (2) (1)/(2)O_(2)(g)toO(g),DeltaH^(0)=249k*mol^(-1) (3) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g),DeltaH_(f)^(0)[H_(2)O(g)]=-241.8kJ*mol^(-1) .

Calculate the electronegativity of carbon from the following data: E_(H-H)=104.2 kcal mol^(-1) , E_(C-C) =83.1kcal mol^(-1) E_(C-H)=98.8 kcal mol^(-1) X_H=2.1

Calculate the molar entropy of vaporisation of water , (Given : H_(2)O (l) hArr H_(2)O (g) , Delta H = 40.8 kJ* mol^(-1) )

Calculate the standard enthalpy of formation of CH_(3)OH(l) from the following data: (1) CH_(3)OH(l)+(3)/(2)O_(2)(g)toCO_(2)(g)+2H_(2)O(l),Delta_(r)H^(0)=-726kJ*mol^(-1) (2) C(s)+O_(2)(g) to CO_(2)(g),Delta_(c)H^(0)=-393kJ*mol^(-1) (3) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),Delta_(f)H^(0)=-286kJ*mol^(-1) .

Calculate the standard enthalpy of reaction at 25^@C temperature for the following reaction : C_6H_6(I) + frac 15/2 O_2 (g) rarr 6CO_2(g)+3H_2O(I) . Given: The standard enthalpy of formation of C_6H_6(I) , .CO_2(g) and H_2O(I) are 49.0kJ mol^-1 , -393.5 kJ mol^-1 and -285.8 kJ mol^-1 respectively.

Determine the standard enthalpy of formation of isoprene(g) at 298K temperature. Given: at 298K, DeltaH^(0)(C-H)=413kJ*mol^(-1) DeltaH^(0)(H-H)=436kJ*mol^(-1) DeltaH^(0)(C-C)=346kJ*mol^(-1) , DeltaH^(0)(C=C)=611kJ*mol^(-1) , C("graphite, s")toC("graphite, g"), DeltaH^(0)=717kJ*mol^(-1)