How Do You Calculate the Molarity of FeSCN2+ in a Complex Solution?

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To calculate the molarity of FeSCN2+ in a complex solution, the molar extinction coefficient is essential for determining concentration through absorbance measurements. The user is struggling with the calculations in the provided data table and seeks assistance specifically with the last column. Without the molar extinction coefficient for FeSCN2+, accurate calculations cannot be completed. Clarification on how to derive or estimate this coefficient is necessary for progressing with the solution. Understanding these concepts is crucial for successfully calculating molarity in complex solutions.
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Were you given the molar extinction coefficient for FeSCN+2?
 
no, i was only given the information on the table.
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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