Calculate the resonance energy of N2O from the following data: Δf H0

1.	Calculate the resonance energy of N2O from the following data: Δf H0 of N2O =82 KJ mol-1 , Bond energies of NΞN, N=N,O=O and N=O bonds are 946 ,418 ,498 and 607 kj mol-1 respectively.
Answer» The equation for the formation of one mole of N₂O will be NΞN (g) + ½ O=O (g) ---> N=N=O Calculated value of Δ_fH⁰ for this reaction will be Δ_fH⁰ = [B.E.(NΞN) + ½ B.E.(O=O)] – [B.E.(N=N) + B.E.(N=O)] =[946 + ½ (498)] – [418 + 607] kj mol-1 = 170kj mol^-1 Resonance energy = Observed Δ_fH⁰ – Calculated Δ_fH⁰ = 82 – 170 = - 88 kj mol^-1.

Calculate the resonance energy of N2O from the following data: Δf H0 of N2O =82 KJ mol-1 , Bond energies of NΞN, N=N,O=O and N=O bonds are 946 ,418 ,498 and 607 kj mol-1 respectively.

Answer»

The equation for the formation of one mole of N₂O will be

NΞN (g) + ½ O=O (g) ---> N=N=O

Calculated value of Δ_fH⁰ for this reaction will be Δ_fH⁰ = [B.E.(NΞN) + ½ B.E.(O=O)] – [B.E.(N=N) + B.E.(N=O)]

=[946 + ½ (498)] – [418 + 607] kj mol-1 = 170kj mol^-1

Resonance energy = Observed Δ_fH⁰ – Calculated Δ_fH⁰ = 82 – 170 = - 88 kj mol^-1.

Discussion

No Comment Found

Related InterviewSolutions

In the following questions ,a statement of assertions(A) is given followed by a corresponding statement of reason (R) just below the statements mark the correct answer as(a)If both (A) and (R)are true and (R) is the true explanation of (A).(b) If both (A) and (R)are true but (R) is not the true explanation of (A).(c ) If (A) is true but (R) is false.(d) If both (A) and (R) is false.Assertion (A): For a particular reaction heat of combustion at constant pressure (qp) is always greater than that of constant volume (qv).Reason (R): Combustion reactions are invariably accompanied by increase in the number of moles.
In the following questions ,a statement of assertions(A) is given followed by a corresponding statement of reason (R) just below the statements mark the correct answer as(a)If both (A) and (R)are true and (R) is the true explanation of (A).(b) If both (A) and (R)are true but (R) is not the true explanation of (A).(c ) If (A) is true but (R) is false.(d) If both (A) and (R) is false.Assertion (A): The enthalpy of formation of gaseous oxygen molecules a 298K and under a pressure of 1 atm is zero.Reason (R): The entropy of formation of gaseous oxygen molecules under the same conditions is zero.
Mention entropy change (ΔS) for : (i) spontaneous process (ii) non-spontaneous process (iii) at equilibrium.
Define the term system and surroundings. Explain the different types of system.
Give relation between Cp and Cv
State First law of thermodynamics. Give its mathematical expression
Write the mathematical statement of first law of thermodynamics.
Deduce the mathematical expression of first law of thermodynamics for the following processes :(1) Isothermal process (2) Isobaric process (3) Isochoric process (4) Adiabatic process.
Classify the following properties as intensive or extensive : (i) Temperature (ii) Density (iii) Enthalpy (iv) Mass (v) Energy (vi) Refractive index (vii) Pressure (viii) Viscosity (ix) Volume (x) Weight.
Write one example each of extensive and intensive properties.

Calculate the resonance energy of N2O from the following data: Δf H0 of N2O =82 KJ mol-1 , Bond energies of NΞN, N=N,O=O and N=O bonds are 946 ,418 ,498 and 607 kj mol-1 respectively.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment