011-40705070  or  
Call me
Download our Mobile App
Select Board & Class
  • Select Board
  • Select Class
Pranav Srinivasan from KENDRIYA VIDYALAYA NO 1 , asked a question
Subject: Chemistry , asked on 26/9/12

 define hess law

Certified by MeritNation Expert

BEST ANSWER

Ishan Goyal , From Dav School Phillaur , added an answer
Answered on 27/9/12

. Hess ' Law states that the heat evolved or absorbed in a chemical process is the same whether the process takes place in one or in several steps. This is also known as the law of constant heat summation. To illustrate Hess 's law, the thermal equations and the energy level diagrams are shown below

 

 

Thermal equations Hess 's law energy level diagram
  • A + B = AB, dH 1
  • AB + B = AB2, dH 2
    then,
    A + 2 B = AB2, dH 1 2 = dH 1 + dH 2
rnrn    ======= A + 2 Bn     |   | dH 1ndH 1 2 | ===== AB + Bn     |   | dH 2n    ======= AB2n
rn  

hope it will definetly help u...

This conversation is already closed by Expert

View More
Ishan Goyal , From Dav School Phillaur , added an answer
Answered on 26/9/12

 ,,,

Ishan Goyal , From Dav School Phillaur , added an answer
Answered on 26/9/12

Hess’s Law