NEET UG CHEMISTRY MCQ: THERMODYNAMICS

1 Hard

1 of 1

Application +4 | -1

Heat of formation of two moles of

\mathrm{NH}_3(\mathrm{~g})

-90 \mathrm{KJ}

. Bond energies of

\mathrm{H}-\mathrm{H}

and

\mathrm{N}-\mathrm{H}

bonds are

435 \mathrm{KJ}

and

390 \mathrm{KJ} \mathrm{mol}^{-1}

respectively. The value of the bond energy of

N=N

will be

View answer and explanation

Correct option: D

945 \mathrm{KJ}

Option D (

945 \text{ KJ}

) is correct because it is calculated using the heat of formation and the given bond energies of H-H and N-H bonds, applying Hess's Law.

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\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})

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\Delta G