Chemical Equilibrium Video Lessons

Concept:

Problem: Under which circumstances are Kp and Kc equal for the reaction aA(g) + bB(g) ⇌ cC(g) + dD(g)?a. If a + b = c + db. If the reaction is irreversible.c. The equilibrium constant is small.

FREE Expert Solution

When dealing with equilibrium:

Kc → equilibrium units are in molarity
Kp → equilibrium units in terms of pressure

Kp and Kc are related to one another by the following equation below:

$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{=}}{{\mathbf{K}}}_{{\mathbf{c}}}{\left(\mathbf{RT}\right)}^{\mathbf{∆}\mathbf{n}}}$

R = gas constant = 0.08206 (Latm)/(molK)
T = temperature, K
Δn = moles of gas products – moles of gas reactants

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Problem Details

Under which circumstances are Kp and Kc equal for the reaction aA(g) + bB(g) ⇌ cC(g) + dD(g)?

a. If a + b = c + d

b. If the reaction is irreversible.

c. The equilibrium constant is small.