[777888]

Hi, I have some questions:

1)What is the Law of Mass Action"?

2)What is the realationship known as "Equilibrium Law"?

[Is there a difference between question 1 and 2? They seem like the same question...]

3)Write the law of mass action for the reaction: H2 + I2 = 2HI
[What is this trying to ask? Is the answer a number? How can I write this law?]

[ssssss]

Hi, I have some questions:

1)What is the Law of Mass Action"?

2)What is the realationship known as "Equilibrium Law"?

[Is there a difference between question 1 and 2? They seem like the same question...]

3)Write the law of mass action for the reaction: H2 + I2 = 2HI
[What is this trying to ask? Is the answer a number? How can I write this law?]

You are asking questions as you dont have a chemistry Book.These are basic principles given in your book in chapter on Chemical Equilibrium.Read it thoroughly.Then if you find any queries,Ask.

[777888]

...
Sorry, I read it but the textbook put law of mass action and equilibrium in the same place! I don't know if the law of mass action means the equation...

[Donaldson Tan]

aA + bB -> cC + dD

Law of Mass Action tells you that [C]^c[D]^d/[A]^ab = constant only if the the above reaction is at  chemical equilibrium, ie.

aA + bB <-> cC + dD

The equilibrium law is a specific form of the law of mass action. The equilibrium law tells you that for a chemical system at equilibrium, its equilibirum constant can be computed as [C]^c[D]^d/[A]^ab. Law of Mass Action confirms that this value is indeed a constant.

[777888]

I am OK with this question now...we treat law of mass action and equilibrium law as the same thing

[777888]

I have another question!

Are all / most reactions equilbrium reactions? Is there a case that is not a equilibrium reaction?

[jdurg]

I have another question!

Are all / most reactions equilbrium reactions? Is there a case that is not a equilibrium reaction?

ALL reactions are equillibrium reactions.  Every single one of them.  It's just that for some reactions the equillibrium is favored towards the products so heavily that we say they are essentially all "forward reactions".  (Such as the combustion of oxygen and hydrogen.  The equillibrium constant favors the formation of water so much that we can disregard the infentesimally small handful of water molecules which decompose back into hydrogen and oxygen).

[777888]

Thanks a lot~

[Mitch]

All reactions are equilibrium reactions except those that are thermodynamically/photochemically forbidden of course.