Question 11.7

[Akshay Anand]

How can you tell that flask 3 is in equilibrium with the information given in the question? How can you know which way the reaction is favored without a k value?

[Chem_Mod]

The key is in the description that the image portrays the dissociation of the diatomic molecule over time. The first image shows no monatomic product so it is at t = 0. Image 2 shows some dissociation and image 3 and 4 show identical numbers of diatomic reactant and monatomic product. Thus, it is at image 3 when equiliibrium is first reached.

[Lorie Seuylemezian-2K]

Can someone help me out with part C of 11.7, I don’t really understand why the answer book is out of 17?

[Girija_3E]

Can someone help me out with part C of 11.7, I don’t really understand why the answer book is out of 17?

17 is the total number of diatomic reactants and monoatomic products there are in the final flask. So, in the equation for solving for K:

K = (X^2)/(X2) = ((12/17) x 0.10)^2/((7/17) x 0.10), where 12 represents the number of monoatomic products, 7 represents the number of diatomic reactants, and 0.10 is the given pressure. Hope that was helpful!

[Lorie Seuylemezian-2K]

Thank you so much! I just wasn't understanding why we originally count out of 17 but now I get it!