Experiment 7: Rate Law for the Reaction of Crystal Violet and Hydroxide Prelab P

Question

Experiment 7: Rate Law for the Reaction of Crystal Violet and Hydroxide Prelab Practice Assignment 1. Nitrous oxide, N2O, undergoes decomposition on a gold surface at 900 °C, obeying the following stoichiometry: 2N20(g) 2N2(g)+O2(g) The concentration of the reactant was monitored as a function of time. A graph of In(NO) vs. t gave the graph shown below. The trendline is printed on the box, with y = In(N2O) and x = t. The correlation coefficient is r =-1k2-0.9995, for a nearly perfect anticorrelation =-1.288E-02x-2.291 E+00 R-9.990E-01 -2.5 -3.5 40 10120 140 20 60 80 time (min)

Explanation / Answer

ln[A] = -kt + ln[A0]

the graph follows the above equation

a) first order

b) units of k =min-1

c) slope = -k = -1.288E-02

k=1.288E-02

d) t(1/2)=0.693/k = 53.80 min

e) intercept = ln [Ao] = -2.291

[Ao] = 0.1011 M

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