Question

For which of the following reactions, $K_{p}=K_{c} ?$

• A. $N _{2}+3 H _{2} 2 NH _{3}$
• B. $N _{2}+ O _{2} 2 NO$
• C. $PCl _{5} PCl _{3}+ Cl _{2}$
• D. $2 SO _{3} 2 SO _{2}+ O _{2}$

Answer 1

Answer: (B)

$K_{p}=K_{c}(R T)^{\Delta n}$
For the reaction: $N_{2}+O_{2} 2 N O$
$\Delta n=2-2=0 $
$\therefore K_{p}=K_{c}(R T)^{0} $
$K_{p}=K_{c}$