5.g.5

[Jasmine Salameh2K]

could someone help me understand a-c on this problem I think a is the first one but I'm not sure.

[Celine 3E]

For A) you have to see when the number of the molecules stops changing. For instance, from which flask to which flask is the number of X2 molecules constant? Whatever that flask is is the answer, because it has reached equilibrium and stopped changing.
For B), you calculate the percent remained of X2 molecules using the number of molecules left divided by the original number of molecules. This is the percent that remained, so then you subtract 1 by this number to get the percent that decomposed.
For C) You use the ratios and percentages remaining in lieu of an ICE table and find the K.