To calculate the Kp of the reaction equation, we’re going to use Hess’s Law. We’re going to manipulate the two reactions with given Kp values such that when we add them together, we will get the reaction equation with the unknown Kp.
Unknown Kp value: C(s) + H2O(g) ⇌ CO(g) + H2(g) Kp = ?
Reaction 1: C(s) + O2( g) ⇌ CO2(g) Kp1 = 1.363 x 1069
Reaction 2: 2H2(g) + O2(g) ⇌ 2H2O(g) Kp2 = 1.389 x 1080
Reaction 3: 2CO(g) + O2(g) ⇌ 2CO2(g) Kp3 = 1.363 1069
The reactions shown here can be combined to make the overall
reaction C(s) + H2O(g) ⇌ CO(g) + H2(g) by reversing some
and/or dividing all the coefficients by a number.
a. C(s) + O2( g) ⇌ CO2(g); K = 1.363 x 1069
b. 2H2(g) + O2(g) ⇌ 2H2O(g); K = 1.389 x 1080
c. 2CO(g) + O2(g) ⇌ 2CO2(g); K = 1.363 1069
Select the correct value for K.
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