How to Calculate Delta G and Keq for Chemistry Test?

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Homework Help Overview

The discussion revolves around calculating the equilibrium constant (Keq) and Gibbs free energy change (Delta G) for chemical reactions. The original poster presents two specific questions related to these concepts, including given values for concentrations and constants.

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  • Mixed

Approaches and Questions Raised

  • Participants discuss the relationship between concentrations at equilibrium and the equilibrium constant, with one suggesting the use of a formula for Keq. There are also inquiries about the formula for Delta G, with some participants expressing a desire for direct answers rather than detailed solutions.

Discussion Status

The discussion includes attempts to clarify the formulas needed for the calculations, with some participants providing equations while others emphasize the importance of understanding the underlying concepts. There is no explicit consensus on the best approach, and multiple interpretations of the questions are being explored.

Contextual Notes

Some participants indicate that the original poster is not seeking homework help in the traditional sense, but rather specific formulas. This may affect the nature of the responses and the overall direction of the discussion.

huan.conchito
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I got these two questions i have no idea how to do (i have answers, but no soln's)
1. Given that the affinity constatn Keq for rxn A+B=AB is 5x10^6 and the concentration of free molecules at equillibrium are Afree = 1x10^-4 and B = 1x10^-8, what is the ration of AB to A at equillibrium

ans: 0.05 : 1

2. What is the Delta G for the forward reaction x <-> y.
Given
R = 1.98x10^-3 kcal/molK
T = 298K
K'eq = 7.5

(ans: -1.18kcal/mol)
 
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Read this before posting :

https://www.physicsforums.com/showthread.php?t=4825
 
Use [tex]K_{eq} = \frac{[AB]}{[A]<b>} </b>[/tex]
 
Gokul43201 said:
Read this before posting :

https://www.physicsforums.com/showthread.php?t=4825
you don't understant.. its not my hw. just tell me the formula for delta g, that's all i need
 
[tex]K= \frac{[x]}{[A-x][B-x]}[/tex]

You should be able to find such equations in the text by yourself, the're all listed explicitly.

...since it's urgent