Thermodynamics ...

Which of the following indicates the heat of reaction equal to heat of formation ?

Calculate ∆H (in Joules) for, C (graphite) → C (diamond), from the following data
C (graphite) + O₂ (g) → CO₂ (g) ; ∆H = - 393.5 kJ
C (diamond) + O₂ (g) → CO₂ (g) ; ∆H = - 395.4 kJ

The ∆H°_f for CO₂ (g), CO(g ) and H₂O (g) are - 393.5, -110.5 and - 241.8 kJ / mol respectively. The standard enthalpy change (in kJ) for the reaction
CO₂ (g) + H₂ (g) → CO (g ) + H₂O (g) is

The value of ∆E for combustion of 16 g of CH₄ is - 885389 J at 298 K. The ∆H combustion for CH₄ in J mol^-1 at this temperature will be
(Given that, R = 8.314 JK^-1mol^-1)

If the bond dissociation energies of XY, X₂ and Y₂ (all diatomic molecules) are in the ratio of 1:1:0.5 and ∆H_f for the formation of XY is -200 kJ mol^-1 . The bond dissociation energy of X₂ will be

For the reaction (at 1240 K and 1 atm.)
CaCO₃ (s) → CaO(s) + CO₂ (g)
∆H = 176 kJ /mol ; ∆E will be

Minimum work is obtained when 1 kg of ... gas expanded under 500 kPa to 200 kPa pressure at 0°C.

Enthalpy of formation of HF and HCl are - 161 kJ and - 92 kJ respectively. Which of the following statements is incorrect ?

A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If ∆H is the enthalpy change and ∆E is the change in internal energy, then