Question

Chemical equilibrium?

Answer 1

A+2B-->C (all gases)
The initial amounts of reactants placed into a 5L vessel were 1 mol A and 1.8 mol B. After the reaction reached equilibrium, 1 mole of B was found. Find Kc.

Answer 2

I need to make an ICE table but I need help on this.

Answer 3

A B C
I 1/5 1.8/5 0
C -x -2x +x
E 1/5-x 1.8/5-2x x

does that make sense to you?

Answer 4

Yes. Why do you go ahead and divide by 5 and not wait until later?

Answer 5

what do you mean later? equilibrium expressions are in terms of concentration

Answer 6

I had a homework problem that was like this and it waited...

Answer 7

In steps 1-5.

Answer 8

oh, we'll it doesn't really matter when you do it. It works out to the same thing (as long as you do it before you plug into the eq. expression).

Answer 9

Ohh ok. Thanks! I really needed that.

Answer 10

no problem, glad you got that clarified !

Answer 11

How would I finish the rest of the problem? That is, solve for X? Do I need to do the product over reactant thing?

Answer 12

I know the final of B...it is given.

Answer 13

@aaronq

Answer 14

well since the give you the final moles of B, you can use 1.8/5-2x=1/5 to find x, note that i divided the number of moles by the volume because i did that earlier.

Answer 15

Ok, so that is .08.

Answer 16

Does that mean I can use .08 for C and plug it in the 1/5 -x for A?

Answer 17

yes

Answer 18

Ok. I understand now. Thank you.

Answer 19

The answer is 17.

Answer 20

no problem ! glad i could help