Question

The reaction $N_2{O}_5\left(In{CCl}_4\right)\to 2{NO}_2+1/2O_2\left(g\right)$ is first order in $N_2{O}_5$ with rate constant $6.2\times {10}^{-4}{S}^{-1}$. What is the value of rate of reaction when $\left[N_2{O}_5\right]=1.25mole{L}^{-1}$

• A. $7.75\times {10}^{-4}{L}^{-1}{S}^{-1}$
• B. $6.35\times {10}^{-3}{L}^{-1}{S}^{-1}$
• C. $5.15\times {10}^{-5}{L}^{-1}{S}^{-1}$
• D. $3.85\times {10}^{-4}{L}^{-1}{S}^{-1}$

Answer 1

The correct option is A $7.75\times {10}^{-4}{L}^{-1}{S}^{-1}$

Its a 1st Order Reaction.

$r=k\left[A\right]$

$r=6.2\times {10}^{-4}\times \left[1.25\right]$

$r=7.75\times {10}^{-4}{L}^{-1}{S}^{-1}$