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Identifying gases in equilibrium via pictures

Posted: Thu Jan 10, 2019 12:16 pm
by Maayan Epstein 14B
For this week's homework, one of the problems (11.7 in the 6th edition) shows a picture of four flasks with gas molecules in them. The gas is an unknown diatomic molecule, X2. Part a of the questions asks: "Which flask represents the point in time at which the reaction has reached equilibrium?"
The answer is the third flask.
I am not sure how to identify this. Please let me know what I should look for in these pictures. Thanks!

Re: Identifying gases in equilibrium via pictures

Posted: Thu Jan 10, 2019 12:23 pm
by Ethan Baurle 1A
This is because there is no change in the composition of the solution from flask 3 to 4. To simplify things, look at the number of ions stuck together and those floating around freely. As the pictures progress, more ions are floating around freely, but in flask 3 and 4 there are the same number of double ions and single ions, thus the system is at equilibrium.

Re: Identifying gases in equilibrium via pictures

Posted: Thu Jan 10, 2019 1:24 pm
by Maayan Epstein 14B
Thank you so much for your response! It makes much more sense now. I guess another way to think about it is that the reactants are the diatomic (stuck together) gas molecules and the products are the single, free floating molecules.