I just need hlep with the \"What was the initial molarity of the reactant? (N20)

Question

I just need hlep with the "What was the initial molarity of the reactant? (N20)o= question

Nitrous oxide, N20, undergoes decomposition on a gold surface at 900 oC, obeying the following stoichiometry: 2 2 (g) 2 N +O 2 (g 2 (g) The concentration of the reactant was monitored as a function of time. A graph of ln(Noo) vs. tgave a graph simlilar to the one in the lab manual. The trendline is Y -0.01283 X -2.749, with a y axis of In(N2O) and x of time. The correlation coefficient r is -0.9993, for a nearly perfect anticorrelation. What is the numerical value of the rate constant, k? Answer: Save my answers What is the reaction order according to the above results? Select one: A. First order B. Second order C. Zero order D. Unable to determine from the given data

Explanation / Answer

The given reaction is first order having the integrated rate law as

ln [N2O] = -kt + ln [N2O]0. Comparing this equation with the regression equation (the equation given), we must have ln [N2O]0 = -2.749.

Take exponential on both sides to obtain

[N2O]0 = e^(-2.749) = 0.06399 0.064

The initial molarity of N2O is 0.064 M (ans).

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