Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Class 11

Chemistry

Thermodynamics and Thermochemistry

Gibbs energy and gibbs energy change

The standard enthalpy of formation of {NH}_{3} is -46.0 {~kJ}

Question

Medium

Solving time: 3 mins

The standard enthalpy of formation of $NH_{3}$ is $- 46.0 kJ mol^{- 1}$ . If the enthalpy of formation of $H_{2}$ from its atoms is $- 436 kJ mol^{- 1}$ and that of $N_{2}$ is $- 712 kJ mol^{- 1}$ , the average bond enthalpy of $N - H$ bond in $NH_{3}$ is

- 964 kJ mol^{- 1}

+ 352 kJ mol^{- 1}

+ 1056 kJ mol^{- 1}

- 1102 kJ mol^{- 1}

Views: 5,545 students

Updated on: Feb 8, 2024

Book:

Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2010

Found 3 tutors discussing this question

Jack Discussed

The standard enthalpy of formation of

NH_{3}

- 46.0 kJ mol^{- 1}

. If the enthalpy of formation of

H_{2}

from its atoms is

- 436 kJ mol^{- 1}

and that of

N_{2}

- 712 kJ mol^{- 1}

, the average bond enthalpy of

N - H

bond in

NH_{3}

11 mins ago

Discuss this question LIVE

11 mins ago

Text solutionVerified

\frac{1}{2} N_{2} (g) + \frac{3}{2} H_{2} (g) NH_{3} (g) ⟶ H = - 46 kJ mol^{- 1}

Bond enthalpy of

H_{2} = 436 kJ mol^{- 1}

[+ ve sign is taken because energy is supplied to break the

H - H

bond into its atoms] Similarly, bond enthalpy of

N_{2} = + 712 kJ mol^{- 1}

Δ_{r} H = [\frac{1}{2} BE (N_{2}) + \frac{3}{2} BE (H_{2})] - 3 BE (N - H)

- 46 = [\frac{1}{2} \times 712 + \frac{3}{2} \times 436] - 3 BE (N - H)

- 46 = (356 + 654) - 3 BE (N - H)

3 BE (N - H) = (1010) + 46

3 BE (N - H) = 1056

BE (N - H) = 1056/3 = 352 kJ mol^{- 1}

Was this solution helpful?

131

Report

Filo tutor solutions (13)

Learn from their 1-to-1 discussion with Filo tutors.

9 mins

Uploaded on: 11/19/2022

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Shanu Kumar

Total classes on Filo by this tutor - 2,887

Teaches : Physics, Biology, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (3 pages)

Download

Was this solution helpful?

114

Report

7 mins

Uploaded on: 10/6/2022

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Gyan Prakash

Total classes on Filo by this tutor - 5,311

Teaches : Physical Chemistry, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (2 pages)

Download

Was this solution helpful?

136

Report

1 mins

Uploaded on: 11/19/2022

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Gyan Prakash

Total classes on Filo by this tutor - 5,311

Teaches : Physical Chemistry, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

126

Report

See more 1-on-1 discussions (10)

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Stuck on the question or explanation?

Connect with our Chemistry tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	The standard enthalpy of formation of $NH_{3}$ is $- 46.0 kJ mol^{- 1}$ . If the enthalpy of formation of $H_{2}$ from its atoms is $- 436 kJ mol^{- 1}$ and that of $N_{2}$ is $- 712 kJ mol^{- 1}$ , the average bond enthalpy of $N - H$ bond in $NH_{3}$ is
Updated On	Feb 8, 2024
Topic	Thermodynamics and Thermochemistry
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1 Video solution: 13
Upvotes	1570
Avg. Video Duration	6 min

The standard enthalpy of formation of $NH_{3}$ is $- 46.0 kJ mol^{- 1}$ . If the enthalpy of formation of $H_{2}$ from its atoms is $- 436 kJ mol^{- 1}$ and that of $N_{2}$ is $- 712 kJ mol^{- 1}$ , the average bond enthalpy of $N - H$ bond in $NH_{3}$ is

Text solutionVerified

Filo tutor solutions (13)

Questions from JEE Mains 2010 - PYQs

Practice questions from Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Practice questions from Thermodynamics and Thermochemistry in the same exam

Practice more questions from Thermodynamics and Thermochemistry

Practice questions on similar concepts asked by Filo students

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 in NH3​ is

Text solutionVerified

Filo tutor solutions (13)

Questions from JEE Mains 2010 - PYQs

Practice questions from Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Practice questions from Thermodynamics and Thermochemistry in the same exam

Practice more questions from Thermodynamics and Thermochemistry

Practice questions on similar concepts asked by Filo students

Related books for questions on Thermodynamics and Thermochemistry

Previous year question papers

The standard enthalpy of formation of $NH_{3}$ is $- 46.0 kJ mol^{- 1}$ . If the enthalpy of formation of $H_{2}$ from its atoms is $- 436 kJ mol^{- 1}$ and that of $N_{2}$ is $- 712 kJ mol^{- 1}$ , the average bond enthalpy of $N - H$ bond in $NH_{3}$ is