Question

In which one of the following reactions, $K_p$ is less than $K_c$?

• A. $ 2 SO _3( g ) \rightleftharpoons 2 SO _2( g )+ O _2$
• B. $ N _2( g )+3 H _2( g ) \rightleftharpoons 2 NH _{3 / g )}$
• C. $ PCl _5( g ) \rightleftharpoons PCl _3( g )+ Cl _2( g )$
• D. $H _{2( g )}+ I _{2( g )} \rightleftharpoons 2 HI _{( g )}$

Answer 1

Answer: (B)

$K_p = K_c(RT)^{Δn_g}, K_p < K_c$ when $Δn_g$ is negative.