Question

9.2 grams of $N _ { 2 } O _ { 4 ( g ) }$ is taken in a closed one litre vessel and heated till the following equilibrium is reached

$N _ { 2 } O _ { 4 ( g ) }$ ⇌ $2 N O _ { 2 ( g ) }$ . At equilibrium, 50% $N _ { 2 } O _ { 4 ( g ) }$ is dissociated. What is the equilibrium constant (in mol litre^–1) (Molecular weight of $\left. N _ { 2 } O _ { 4 } = 92 \right)$

• A. 0.1
• B. 0.4
• C. 0.2
• D. 2

Answer 1

Answer: (C)

0.2

Answer 2

$K _ { c } = \frac { \left[ N O _ { 2 } \right] ^ { 2 } } { \left[ N _ { 2 } O _ { 4 } \right] }$ $= \frac { 4 \times ( 0.05 ) ^ { 2 } } { 0.05 } = 4 \times 0.05 = 0.2$