Thermochemistry Questions

The standard enthalpies of formation of CO2(g), H2O(l) and glucose(s) at 250C are -400 kJ/mol, -300 kJ/mol & -1300 kJ/mol respectively. The standard enthalpy of combustion per gram of glucose at 2...

Heat of neutralisation of CsOH with all strong acid is 13.4 kcal mol-1. The heat released on neutralisation of CsOH with HF (weak acid) is 16.4 kcal mol-1. ∆H of ionisation of HF is...

The enthalpy of combustion of propane (C3H8) gas in terms of given data is : Bond energy (kJ/mol) εC-H εO=O εC=O εO-H εC-C +x1 +x2 +x3 +x4 +x5Resonance energy of CO2 is - zkJ/...

Match the transformations in column I with appropriate options in column II...

Using the data provided, calculate the multiple bond energy (kJ mol-1) of a C ≡ C bond in C2H2. That energy is (take the bond energy of a C - H bond as 350 kJ mol-1) 2C(s) → 2C(g) ; ᐃH = 1410 kJ...

Enthalpy change for the reaction,4H(g) → 2H2 (g) is - 869.6 kJ The dissociation energy of H - H bond is

The standard enthalpy of formation of NH3 is - 46.0 kJ mol-1. If the enthalpy of formation of H2 from its atoms is - 436 kJ mol-1 and that of N2 is -712 kJ mol-1, the average bond enthalpy of N-H bond...

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

The bond energy (in kcal mol-1) of a C - C single bond is approximately

The ᐃHof for CO2(g), CO(g) and H2O(g) are - 393.5 - 110.5 and 241.8 kJ mol -1 respectively. The standard enthaly change (in kJ mol -1 ) for the reaction CO2(g) + H2(g) → CO(g) + H2O(g) is ...

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: The energy involved in the conversion of Cl2(g) to Cl-(g) (using the data, ᐃdissHCl2- = 240 k...

The standard enthalpy of formation (ᐃfHo) at 298 K for methane, CH4(g), is - 74.8 kJ mol–1. The additional information required to determine the average energy for C - H bond formation would b...

The enthalpy changes for the following processes are listed below: Cl2(g) = 2Cl(g), 242.3 kJ mol-1 I2(g) = 2I(g), 151.0 kJ mol-1 ICl(g) = I(g) + Cl(g), 211.3 kJ mol-1 I2(s) = I2(g), 62.76 kJ mol-1 Giv...

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

The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide per mole is

The enthalpy change for a reaction does not depend upon

The ᐃHfo for CO2(g), CO(g) and H2O(g) are - 395.5, - 110.5 and - 241.8 kJ mol-1 respectively. The standard enthalpy enthaly change (in kJ) for the reaction CO2(g) + H2(g) → CO(g) + H2O(g) ...

AB, A2 and B2 are diatomic molcules. If the bond enthalpies of A2 AB and B2 are in the ratio 1 : 1 :0.5 and enthalpy of formation of AB from A2 and B2 is - 100kJ mol-1. What is the bond energy of A2...

The enthalpy change of a reaction does not depend on :

S + O2 + x kcal .......(1)SO2 + O2 → SO2 + y kcal .......(2)The heat of formation of SO3 in the above reactior :...