Question

Nitrogen tetra oxide $\left(N_2{O}_4\right)$ decomposes as $N_2{O}_4\left(g\right)\to 2N{O}_2\left(g\right)$. If the pressure of $\left(N_2{O}_4\right)$ falls from 0.50 atm to 0.32 atm is 30 minutes, the rate of appearance of $N{O}_2\left(g\right)$ is

• A. 0.006 atm/min
• B. 0.003 atm/min
• C. 0.012 atm/min
• D. 0.024 atm/min

Answer 1

Answer: (C)

0.012 atm/min

Rate of disappearance of $N_2{O}_4$
$=\frac{\Delta \left[N_2{O}_4\right]}{\Delta t}=\frac{0.50-0.32}{30}$
= 0.006 atm/min
Rate of appearance of $N{O}_2$ = Twice of rate of disappearance of $N_2{O}_4$
$=2\times 0.006$ = 0.012 atm/min