Question

Review Topics
References
Chapter 14: EOC

A 1.500 L vessel was filled with 0.1540 mol CO and 0.4260 mol H2 . When this mixture came to equilibrium at a certain temperature, the vessel contained 0.1160 mol CO . Obtain the value of Kc for the following reaction:

CO +2H2 is in equilibrium to yield CH3OH . All are in gas phase.

=

Answer 1

concentration of CO = 0.1540 /1.50 = 0.1027 M

concentration of H2 = 0.4260 / 1.500 = 0.284 M

CO    +     2 H2   --------------> CH3OH

0.1027      0.284                             0

0.1027-x     0.284 -2x                      x

at equilibrium

concentration of CO = 0.1160 / 1.5 = 0.0773 M

0.1027-x = 0.0773

x = 0.0254

[H2] = 0.284 - 2 x 0.0254 = 0.2332 M

Kc = [CH3OH] / [CO][H2]^2

     = 0.0254 / (0.0773)(0.2332)^2

     = 6.04

Kc = 6.042