# Delta G and Keq Urgent, test in 1 day

1. Apr 14, 2005

### huan.conchito

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)

2. Apr 14, 2005

### Gokul43201

Staff Emeritus
3. Apr 14, 2005

### QuantumMech

Use $$K_{eq} = \frac{[AB]}{[A]}$$

4. Apr 14, 2005

### huan.conchito

5. Apr 14, 2005

### GCT

$$K= \frac{[x]}{[A-x][B-x]}$$

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

...since it's urgent