I with chemical equilibrium problems

[allistair3421]

1. okay so the equation is:
3A+2B---->C+D
K=1.00x10(to the negative third power)
A=9.5-M C=0.0200-M D=0.0200 what is B ?



3. the answer is either 1.24: 0.0216: : 0.00180 : or 0.110
(i don't remember) so what i don't get is HOW DO I SET UP THE PROBLEM?

go step by step if you can and if you know some sites that would help post those too

 

[danago]

If you have some chemical reaction:

aA + bB ----> cC + dD

At equilibrium, the concentration of A, B, C and D are related to the equilibrium constant, K:

<br /> K = \frac{[C]^c [D]^b}{[A]^a <b>^b}<br /> </b>

Where a, b, c and d are the stoichiometric coefficients.

How can you apply this to the given problem?