Enthalpies (Bond, Combustion, Formation…): JEE Questions & Solutions

Consider the following data: Δ_f H^⊖ (methane, g) = -X kJ mol⁻¹ Enthalpy of sublimation of graphite = Y kJ mol⁻¹ Dissociation enthalpy of…

The heat of atomisation of methane and ethane are x kJ mol⁻¹ and y kJ mol⁻¹ respectively. The longest wavelength (λ) of light capable of…

The formation enthalpies, Δ H_f^°, for H_(g) and O_(g) are 220.0 kJ mol⁻¹ and 250.0 kJ mol⁻¹, respectively, at 298.15 K, and Δ H_f^° for…

Consider the following data: - Heat of formation of CO₂(g) = -393.5 kJ mol⁻¹ - Heat of formation of H₂O(l) = -286.0 kJ mol⁻¹ - Heat of…

Given: Δ H^⊖_sub[C(graphite)] = 710 kJ mol⁻¹ Δ_(C-H) H^⊖ = 414 kJ mol⁻¹ Δ_(H-H) H^⊖ = 436 kJ mol⁻¹ Δ_(C=C) H^⊖ = 611 kJ mol⁻¹ The Δ_f H^⊖…

Resonance in X₂Y can be represented as The enthalpy of formation of X₂Y ( X ≡ X(g) + 1/2 Y = Y(g) → X₂Y(g)) is 80 kJ mol⁻¹. The magnitude…

28.0 L of CO₂ is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at 25^° C and 1 atm. Heat evolved during…

The number of endothermic process/es from the following is: A. I₂ (g) → 2I (g) B. HCl (g) → H (g) + Cl (g) C. H₂O (l) → H₂O (g) D. C (s) +…

Solid fuel used in rocket is a mixture of Fe₂O₃ and Al (in ratio 1: 2) the heat evolved (KJ) per gram of the mixture is (Nearest integer)…

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Isotopes of hydrogen…