Hess's Law: JEE Questions & Solutions

If the enthalpy of sublimation of Li is 155 kJ mol⁻¹, enthalpy of dissociation of F₂ is 150 kJ mol⁻¹, ionization enthalpy of Li is 520 kJ…

Consider the following cases of standard enthalpy of reaction (Δ H_r^° in kJ mol⁻¹): C₂H₆(g) + 7/2 O₂(g) → 2 CO₂(g) + 3 H₂O(l) Δ H₁^° =…

S(g) + 3/2 O₂(g) → SO₃(g) + 2x kcal SO₂(g) + 1/2 O₂(g) → SO₃(g) + y kcal The heat of formation of SO₂(g) is given by:

If C(diamond) → C(graphite) + X kJ mol⁻¹ C(diamond) + O₂(g) → CO₂(g) + Y kJ mol⁻¹ C(graphite) + O₂(g) → CO₂(g) + Z kJ mol⁻¹ at constant…

Two reactions are given below: 2Fe(s) + 3/2O₂(g) → Fe₂O₃(s), Δ H^° = -822 kJ/mol C(s) + 1/2O₂(g) → CO(g), Δ H^° = -110 kJ/mol The enthalpy…

The enthalpy change for the conversion of 1/2 Cl₂(g) → Cl⁻(aq) is (-)..... kJ mol⁻¹ (Nearest integer) Given: Δ_fH^°(Cl₂(g)) = 240 kJ mol⁻¹,…

At 25^° C, the enthalpy of the following processes are given: H₂(g) + O₂(g) → 2OH(g) Δ H^° = 78 kJ mol⁻¹ H₂(g) + 1/2 O₂(g) → H₂O(g) Δ H^° =…

Consider the following data: Heat of combustion of H₂(g) = -241.8 kJ mol⁻¹ Heat of combustion of C(s) = -393.5 kJ mol⁻¹ Heat of combustion…

Given: (A) 2CO(g) + O₂(g) → 2CO₂(g), Δ H₁^° = -x kJ mol⁻¹ (B) C(graphite) + O₂(g) → CO₂(g), Δ H₂^° = -y kJ mol⁻¹ The Δ H^° for the reaction…