369534 What is enthalpy of formation of \(\mathrm{NH}_{3}\) if bond enthalpies are as
\((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ}\),
\((\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}\) ?

369535 From the following bond energies:
\(\mathrm{H-H}\) bond energy: \(\mathrm{431.37 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C=C}\) bond energy: \(\mathrm{606.10 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-C}\) bond energy: \(\mathrm{336.49 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-H}\) bond energy: \(\mathrm{410.50 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
Enthalpy for the reaction will be :

369536 Statement A :
The mean bond energy of all the four \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds in \(\mathrm{\mathrm{CH}_{4}}\) molecule is not equal.
Statement B :
After breaking of \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds one by one, the electronic environments changes.

369537 The standard enthalpy of formation of \(\mathrm{\mathrm{NH}_{3}}\) is \(\mathrm{-46.0 \mathrm{~kJ} / \mathrm{mol}}\). If the enthalpy of formation of \(\mathrm{\mathrm{H}_{2}}\) from its atoms is \(\mathrm{-436 \mathrm{~kJ} / \mathrm{mol}}\) and that of \(\mathrm{N_{2}}\) is \(\mathrm{-712 \mathrm{~kJ} / \mathrm{mol}}\), the average bond enthalpy of \(\mathrm{\mathrm{N}-\mathrm{H}}\) bond in \(\mathrm{\mathrm{NH}_{3}}\) is:

369534 What is enthalpy of formation of \(\mathrm{NH}_{3}\) if bond enthalpies are as
\((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ}\),
\((\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}\) ?

369535 From the following bond energies:
\(\mathrm{H-H}\) bond energy: \(\mathrm{431.37 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C=C}\) bond energy: \(\mathrm{606.10 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-C}\) bond energy: \(\mathrm{336.49 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-H}\) bond energy: \(\mathrm{410.50 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
Enthalpy for the reaction will be :

369536 Statement A :
The mean bond energy of all the four \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds in \(\mathrm{\mathrm{CH}_{4}}\) molecule is not equal.
Statement B :
After breaking of \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds one by one, the electronic environments changes.

369537 The standard enthalpy of formation of \(\mathrm{\mathrm{NH}_{3}}\) is \(\mathrm{-46.0 \mathrm{~kJ} / \mathrm{mol}}\). If the enthalpy of formation of \(\mathrm{\mathrm{H}_{2}}\) from its atoms is \(\mathrm{-436 \mathrm{~kJ} / \mathrm{mol}}\) and that of \(\mathrm{N_{2}}\) is \(\mathrm{-712 \mathrm{~kJ} / \mathrm{mol}}\), the average bond enthalpy of \(\mathrm{\mathrm{N}-\mathrm{H}}\) bond in \(\mathrm{\mathrm{NH}_{3}}\) is:

369534 What is enthalpy of formation of \(\mathrm{NH}_{3}\) if bond enthalpies are as
\((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ}\),
\((\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}\) ?

369535 From the following bond energies:
\(\mathrm{H-H}\) bond energy: \(\mathrm{431.37 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C=C}\) bond energy: \(\mathrm{606.10 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-C}\) bond energy: \(\mathrm{336.49 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-H}\) bond energy: \(\mathrm{410.50 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
Enthalpy for the reaction will be :

369536 Statement A :
The mean bond energy of all the four \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds in \(\mathrm{\mathrm{CH}_{4}}\) molecule is not equal.
Statement B :
After breaking of \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds one by one, the electronic environments changes.

369537 The standard enthalpy of formation of \(\mathrm{\mathrm{NH}_{3}}\) is \(\mathrm{-46.0 \mathrm{~kJ} / \mathrm{mol}}\). If the enthalpy of formation of \(\mathrm{\mathrm{H}_{2}}\) from its atoms is \(\mathrm{-436 \mathrm{~kJ} / \mathrm{mol}}\) and that of \(\mathrm{N_{2}}\) is \(\mathrm{-712 \mathrm{~kJ} / \mathrm{mol}}\), the average bond enthalpy of \(\mathrm{\mathrm{N}-\mathrm{H}}\) bond in \(\mathrm{\mathrm{NH}_{3}}\) is:

369534 What is enthalpy of formation of \(\mathrm{NH}_{3}\) if bond enthalpies are as
\((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ}\),
\((\mathrm{N}-\mathrm{H})=389 \mathrm{~kJ}\) ?

369535 From the following bond energies:
\(\mathrm{H-H}\) bond energy: \(\mathrm{431.37 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C=C}\) bond energy: \(\mathrm{606.10 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-C}\) bond energy: \(\mathrm{336.49 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
\(\mathrm{C-H}\) bond energy: \(\mathrm{410.50 \mathrm{~kJ} \mathrm{~mol}^{-1}}\)
Enthalpy for the reaction will be :

369536 Statement A :
The mean bond energy of all the four \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds in \(\mathrm{\mathrm{CH}_{4}}\) molecule is not equal.
Statement B :
After breaking of \(\mathrm{\mathrm{C}-\mathrm{H}}\) bonds one by one, the electronic environments changes.

369537 The standard enthalpy of formation of \(\mathrm{\mathrm{NH}_{3}}\) is \(\mathrm{-46.0 \mathrm{~kJ} / \mathrm{mol}}\). If the enthalpy of formation of \(\mathrm{\mathrm{H}_{2}}\) from its atoms is \(\mathrm{-436 \mathrm{~kJ} / \mathrm{mol}}\) and that of \(\mathrm{N_{2}}\) is \(\mathrm{-712 \mathrm{~kJ} / \mathrm{mol}}\), the average bond enthalpy of \(\mathrm{\mathrm{N}-\mathrm{H}}\) bond in \(\mathrm{\mathrm{NH}_{3}}\) is: