[Frederick95]

When carbon dioxide is heated in a closed container, it decomposes into carbon monoxide and oxygen according to the following equilibrium equation:
2CO2(g) ---> 2CO(g) + O2(g)

When 2.0 mol of CO2(g) is placed in a 5.0-L closed container andheated to a particular temperature, the equilibrium concentration of CO2(g) is measured to be 0.039 mol/L. Use an ICE table to determine the equuilibrium concentrations of CO(g) and )2(g)


My ICE table appearrs as the following:


     2CO2(g) -------->2CO(g)  +  O2(g)
I    2.0                       0             0
C   -2x                       +2           +x
E   0.39                     +2x          +x



Im really stuck on the part with the calulcations please help.

[boostar]

When 2.0 mol of CO2(g) is placed in a 5.0-L closed container and heated to a particular temperature, the equilibrium concentration of CO2(g) is measured to be 0.039 mol/L. Use an ICE table to determine the equilibrium concentrations of CO(g) and )2(g)

     2CO2(g) -------->2CO(g)  +  O2(g)
I    2.0                       0             0
C   -2x                       +2           +x
E   0.39                     +2x          +x

Do you see your mistake?

Once you have corrected your mistake, you will know

1) 2 moles you began with
2) Moles of CO2 that are left.

Than check out your stoichiometry equation to figure out the rest. (hint: figure out how much CO2 has been lost, and than think about what this has to do with your x values: 2x and x in your products)

Edit: P.S I think the people here like it if you keep questions in one topic - especially questions of the same type.

[Henri]

I would do this something like this:

     2CO2(g) -------->2CO(g)  +  O2(g)
I    2.0                       0             0
C   -2x                       +2x           +x
E   2-2x                     +2x          +x

As we know that 2-2x = 0.39 => x=0.805
And then just insert that value to x and 2x.

[Frederick95]

The answers are supposedly  [CO(g)] = 0.01 mol/L; [O2(g)] = 0.005 mol/L

How do I get them?

[Nathaniel]

inserting that value to x and 2x does not give [CO(g)] = 0.01 mol/L; [O2(g)] = 0.005 mol/L
Is there an alternative way to solve the question?