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Chemistry Homework Help => AP Chemistry => Topic started by: Chandrasekhar on April 17, 2026, 03:59:51 PM

Title: AP chemistry unit 7 question on concentrations at equilibrium
Post by: Chandrasekhar on April 17, 2026, 03:59:51 PM
mam, could you explain why the answer can't be 1, 2 and 3?Screenshot 2026-04-17 125449.png
Title: Re: AP chemistry unit 7 question on concentrations at equilibrium
Post by: uma on April 18, 2026, 10:31:57 AM
Mkae the RICE table to see the final answer.
Since the question says equal numbers of moles of HCl and O2  are taken initially, we can simply assume their initial concentrations are equal.

Let the initial concentration of each reactant be 1.
                        R  4HCl(g) +  O2�(g)⇌ 2Cl2�(g)  +  2H2�O(g)
                                       I     1          1       0           0
                                       C     -4x         -x      +2x        +2x
                                       E      1-4x        1-x     2x        2x
From this its clear that II and III are correct.However I can not be predicted as it depends on the value of x.
So this is not something that must always be true.
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