Heat of formation in general can be positive negative and zero

✔️ According to IUPAC heat of formation of elements in it's stable form(standard state) is zero.
✔️ Generally heat of formation is negative but for a unstable product the heat of formation is positive
Trick:
🔥 ∆Hf for stable product is negative
🔥∆Hf for unstable product is positive
🔥∆Hf for elements in its standard state is zero


✔️For the second question its mentioned heat of formation of compounds
So answer will be positive and negative

Grab the discount on all our test series and enroll yourself for Scholarship test. Few hours left
Grab it now
https://gchemclasses.in

Dear JAM Aspirants
Today you have a test at 9AM
Syllabus: basic organic chemistry and stereochemistry

If you still didn't join then join now
https://play.google.com/store/apps/details?id=co.nick.mecum

Congratulations, Test 07, solid state

Congratulations...

Gchem Classes is announcing Scholarship cum admission test for JAM and GATE 2021.

Take the first step towards success and appear in GSAT on 11April 10 AM.

Grab great offers by appearing in GSAT 2021.


How to enroll for GSAT 2021?

Go to the link and download the app
https://play.google.com/store/apps/details?id=co.nick.mecum
Sign up yourself by giving email id and mobile number.

Then enter to the batch with the batch code GSAT2021

Exam will be conducted on Gchemclasses App

Co-ordination Compounds

Class 1
https://youtu.be/zBCovzXn7o4

class 2 with DPP

https://youtu.be/Lu68K5EJCdg

Hurry offer ends by Sunday...

Coordination chemistry video updates.

Hello all, you will get your coordination chemistry lecture 04 soon... watch gchem classes youtube channel for regular video lecture.

Good afternoon all, here is your 4th coordination chemistry lecture. Link: https://youtu.be/K3yhrxwhQic

Hello everyone, you can ask your doubt here.

It will be easy for all if we discuss the doubt releted the latest video lectures, all will have smooth knowledge on the topic.

Good morning students, here is your lecture 5 in coordination chemistry. To calculate spin only magnetic moment.

https://youtu.be/WfNewwCvX3E

Solve those problems. It will help you to solve in JAM/GATE paper.