For the gas-phase reaction NO + NO + Cl → 2 NOCl at 298 K

CHEMISTRY · Subjective · A Level · Chemistry · Rate equations · Rate equations

Problem

For the gas-phase reaction NO + NO + Cl

_2

→ 2 NOCl at 298 K, a mechanism leads to the rate expression

\text{rate}=k_{\text{app}}[\text{NO}]^{2}[\text{Cl}_2]

. Using the two experimental runs below, calculate

k_{\text{app}}

for each run and indicate whether the values are consistent within significant figures. Run 1: [NO] = 0.10 M, [Cl

_2

] = 0.050 M, initial rate =

1.3\times10^{-4}

M s

^{-1}

Run 2: [NO] = 0.20 M, [Cl

_2

] = 0.050 M, initial rate =

5.2\times10^{-4}

M s

^{-1}