Calculate Kc if Kp for the following reaction is Ag₂CO₃ (s) ⇌ 2 Ag⁺ (g) + CO₃²⁻ (g) at 35 ᵒC is 0.145.

Answer 1

You can use the expression Kp = Kc(RT)^∆n and rearrange to solve for Kc

Ag₂CO₃(s) <==> 2Ag⁺(g) + CO₃^2-(g)

Kp = 0.145

R = 0.0821 Latm/Kmol

T = 35ºC + 273 = 308K

∆n = change in number of moles of gas = 3 - 0 = 3

Kc = Kp / (RT)³

Kc = (0.145) / (0.0821 x 308)³

Kc = 0.145 / 16,169

Kc = 8.97x10^-6

(be sure to check my math)