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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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nevada nevada
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11 years ago
i have no idea how to do these 2 questions.
can you please explain step by step, thanks


A(g)+2B ←→ C(g)
the initial concentrations are [A] = [ B ] = [C] = 0.100 atm. Once equilibrium has been established, it is found that [C] =0.040 atm. What is ∆G for this reaction at 25C?


What is the pH of a 0.125 M solution of the weak base B if ∆H= -28.0 kJ and ∆S =-175 J/K for the following equilibrium reaction at 25C?

Ba(aq)=H2O(l)←-> BH(aq)+OH(aq)
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11 years ago
Are you using this textbook by any chance?
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nevada Author
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#2
11 years ago
No, I am using chemistry by zumdahl 8th edition
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#3
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11 years ago Edited: 11 years ago, Laser_3
                    A(g)  +  2B ←→ C(g)
Initial             .1         .1          .1
Change         +x         +2x        -x
Equilibrium    .1+x     .1+2x      .1-x

and we know [C] at eq  = .04  therefore    .1-x = .04   ==> x = .06

[A] = .1+.06 = .16       [B ] = .1+2(.06) = .22

K = (.04)/(.16 * .22^2) = 5.165

G = -RT *ln(Keq)
G = -8.314 * (25+273) * ln(5.165) = -4067.94 J or -4.06794 KJ

Hope this helps,
Laser
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#4
11 years ago
Thanks Laser_3
When you like a flower, you just pluck it out.
But when you love a flower, you water it daily.
The one who understands this, understands life.

- That's the difference between I like you and I love you.
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Laser_3Laser_3
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11 years ago
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