At high temperatures, carbon reacts with O2 to produce CO as follows: C(s) O2(g) 2CO(g). When 0.350 mol of O2 and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, Kc, for this reaction

Value of is 0.090.

Explanation:

Initial molarity of = = 0.0700 M

Construct an ICE table corresponding to the combustion reaction of carbon to determine

              I (M):    -      0.0700        0

             C (M):  -          -x             +2x

             E (M):   -    0.0700-x       2x

So,  , where [CO] and represents equilibrium concentration of CO and respectively.

Here,

       ⇒x = 0.030

So, = 0.0700-x = (0.0700-0.030) = 0.040

Hence,  

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.