Chemical Equilibria and Reaction Quotients

Many chemical reactions don't just go one way, they go forwards and backwards. Once there is balance between the two, this is an equilibrium. And we need to be able to predict how much stuff there will be at equilibrium! Get ready to bust out those ICE boxes, folks.
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Hello, On the checking comprehension why is [NO2]^2 changed to 4x^2 and not 2x^2? Is it because of the equation give?

[@ProfessorDaveExplains]

don't forget that when you do (2x)^2 the exponent operates on both the 2 and the x! so it becomes (2^2)(x^2) or 4x^2

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Hi professor Dave. Thanks again for the great videos. Quick question on the checking comprehension. Did you multiply both sides by negative one to get to the quadratic form? When I multiply both sides by the denominator, I get the opposites for addition and subtraction.

[@ProfessorDaveExplains]

nope i just brought the left side to the right side! if you have 0.036 - 0.36x and you bring it to the other side to be with 4x^2, you have to subtract the number and add the x term so the signs reverse.

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Hey Professor Christ. Suppose If I take the equation of PCl5 PCl3 and Cl2 at 1:44 . Now, since Kc(equilibrium constant) is independent of initial concentration, I can take Z molar solution and should still get the same answer. But if initial concentration is Z and degree of dissociation is a , Kc comes out to be (Za)^2/(Z-Za) => Za^2/(1-a). That is, it depends on Z(initial concentration) . PLEASE HELP.

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question Equilibrium does mean the rate of the forward reaction is equal to the rate of the reverse reaction Equilibrium constant = forward reaction / backward reaction If equal, it means one Why does the reaction reach the equilibrium state? The equilibrium constant is not one?

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[@dr.bucci.]

Thank you very much this is extremely helpful. However, I am confused about how you got 4x^2 in the numerator when solving for X using the Equilibrium Constant Expression. Could you explain why we use 4x^2 instead of 2x^2? Thanks again!

[@ProfessorDaveExplains]

you have to square the 2 as well!

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Can I ask something? What if the K is greater than 1 but the product is a solid. Is it still product favored?

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May I know how you solve 0.126=x/0.10-2x? If possible, please show me step by step. Thank you Dave.

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in 2:52 why did he only take away one (0.135) form the 1m instead of two? shouldn't the product be 0.730 as both reactants have 0.135. someone please explain

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hello, prof. dave, i would like to ask which equilibrium constant(Kp or Kc) we should consider when a reaction involves GAS and LIQUID and even SOLID in the same reaction

[@ProfessorDaveExplains]

ah good question, i suppose Kc? that's just a general equilibrium constant.

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well in thermodynamics we have K=e^-DeltaG/RT now which 'K' is that one!? these are actually ignore in our ordinary books. i dont understand why are these little things are ignored.

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It's Kc

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i have a question about the example, how did you professor Dave get 0.036 from? And why is it 4x^2?

[@ProfessorDaveExplains]

(2x)^2 = 4x^2, and the rest is just from doing some algebra. check out my algebra tutorials if its confusing!

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Hi Professor Dave, for the answer 0.12, I know in the table it's 2x so 2 * 0.06 would be 0.12, but the question asks for NO2 while in the table is the concentration for 2NO2 so shouldn't that be divided by 2 again and get 0.6 (NO2) as the final answer? Sorry for my bad english

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No , if 1 mole of n2o4 gives 2 mole of no2 so in total moles of no2 will be 2 moles not 1 mole

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