Nitrosyl chloride forms by the reaction 2 NO(g) + Cl₂(g) → 2 NOCl(g) A chemist…
CHEMISTRY · Multi-part · CBSE · Chemistry · Chemical Kinetics · Chemical Kinetics
Problem
Nitrosyl chloride forms by the reaction
2 NO(g) + Cl₂(g) → 2 NOCl(g)
A chemist measures the concentration of NOCl in a 1.50 L reaction vessel at several times; the results are shown below.
Time (s) | 0 | 30 | 60 | 90 | 120 | 150
[NOCl] (mol L⁻¹) | 0.000 | 0.048 | 0.091 | 0.127 | 0.156 | 0.179
(a) Calculate the average rate of formation of NOCl between 0 s and 60 s.
(b) Calculate the average rate of formation of NOCl between 90 s and 150 s.
(c) Compare the two rates obtained in parts (a) and (b). What do the results suggest about how the rate changes as the reaction proceeds? Provide a chemical explanation based on concentration effects.
(d) Using the balanced equation, determine the average rate of disappearance of NO(g) between 90 s and 150 s. Include the correct sign and units.
(e) If the chemist wanted to determine the instantaneous rate at 90 s, describe a graphical method that could be applied to the data collected. Explain why this method would yield a more precise value than the average-rate calculations performed above.