Question

Please help with my Pre-lab. Not sure where I'm going wrong.

Studying a reaction of the type X_(red) à Y_(colorless) at room temperature, two students collect the following absorbance data at a l_max = 505 nm for X_(red) as a function of time from a sample of X_(red) with a starting (initial) concentration of 2.01 x 10^-5 M. The molar absorptivity, ε, of X_(red) is 3.44 x 10⁴ cm^-1M^-1 at 505 nm and the optical path length can be taken as b = 1.00 cm.

Table P7S1 Absorbance at λmax = 505 nm for X(red) at Various Time Points
Time (s)	0.00	5.00	10.00	15.00	20.00	25.00	30.00
Absorbance	0.678	0.508	0.399	0.332	0.283	0.247	0.218

Question 1 (6 p).   Transform (convert) the above absorbance values into concentration (mol/L or M). Using graphical analysis determine the rate order “n” and the rate constant “k_obs” for the reaction. Paste-in ALL the graphs used to determine the correct values of n and k_obs, giving the linear equation with R² value (from Excel). Title the plots and label the axes correctly. Clearly explain how you derived the values of n and k_obs.

Answer 1

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