Short Answer TypeCalculate the enthalpy change of reaction:
at 298K, given that the enthalpies of formation at 298 K for 
Enthalpies of formation of CO(g), CO2(g), N2O(g) and N2O4 (g) are -110, -393, 81 and 9.7 kJ mol-1. Find the value of 
for the reaction:
N2O4 (g) + 3CO(g) 
N2O(g) + 3CO2(g)
Long Answer TypeThe combustion of one mole of benzene takes place at 298K and 1 atm. After combustion, CO2(g) and H2O(l) are produced and 3267.0 kJ of heat is liberated. Calculate the standard enthalpy of formation of ∆fH° benzene, given that standard enthalpy of formation of CO2(g) and H2O(l) are –393.5 kJ mol–1 and –285.83 kJ mol–1respectively.
Short Answer TypeLong Answer TypeExplain why enthalpy of neutralization of a strong acid and strong base remains the same and the value changes if one of them is weak.
Explain the following:
(i) Enthalpy of fusion
(ii) Enthalpy of vaporization
(iii) Enthalpy of sublimation.
Short Answer TypeDifferentiate between change of state and phase change.
if the heats of formation of 
respectively.
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