# I need help with chemical equilibrium problems

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
Gold Member
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:

$$K = \frac{[C]^c [D]^b}{[A]^a ^b}$$

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

How can you apply this to the given problem?