In which one of the following reactions, Kp is less than Kc?

Question

In which one of the following reactions, Kp is less than Kc? (A)  2 SO 3( g ) leftharpoons 2 SO 2( g )+ O 2 (B)  N 2( g )+3 H 2( g ) leftharpoons 2 NH 3 / g ) (C)  PCl 5( g ) leftharpoons PCl 3( g )+ Cl 2( g ) (D) H 2( g )+ I 2( g ) leftharpoons 2 HI ( g )

Tardigrade Admin · Accepted Answer

Kp = Kc(RT)Δng, Kp < Kc when Δng is negative.

Q. In which one of the following reactions, $K_{p}$ is less than $K_{c}$ ?

$2 S O_{3} (g) ⇌ 2 S O_{2} (g) + O_{2}$

$N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3/ g)}$

$PC l_{5} (g) ⇌ PC l_{3} (g) + C l_{2} (g)$

$H_{2 (g)} + I_{2 (g)} ⇌ 2 H I_{(g)}$

$K_{p} = K_{c} (RT)^{Δ n_{g}}, K_{p} < K_{c}$ when $Δ n_{g}$ is negative.

Q. In which one of the following reactions, Kp​ is less than Kc​?

2SO3​(g)⇌2SO2​(g)+O2​

N2​(g)+3H2​(g)⇌2NH3/g)​

PCl5​(g)⇌PCl3​(g)+Cl2​(g)

H2(g)​+I2(g)​⇌2HI(g)​