Question

Bence of Concentration on Time (C) 2015 Review Constants Periodic Tat Part A The reactant concentration in a zero-order reaction was 9.00 10-2 Matter 190 s and 400*10-2 Mafter 315s What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. View Available Hints) IHA OO? Value Units Submit Part B Complete previous part(s) Part The reactant concentration in a first-order reaction was 750-10-2 Matter 100s and 380-10- Matter 100 s. What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. View Available Hints) HAO? Value Units Submit

Answer 1

We know for Zeuo Integrated that order reaction rate law is- A): Ap) - kt 1. For t= 1905 [A] = 9x102M 9x10-22 40] - K (1905) for t= 315's 4x10-2, [ AJ = 4x10^2M [AO] -k [ 3155) (11) “ – cür 9x102-4x102 = [AD) - (40) - (190) + k (315) =) 5x102 = k1125) - k = 4x10-4 M/s. for first Integrated order reaction rate lawi's LA) - Ao ett for i talos _A) - 7.90x10^2m. 7.90x10^2 = [Aple-kllos) clio for i t= loosL 3.80x10-3 3 LA) 3,80 x10-3M [Ao) e klloso -lis رشه رت 7.90x10 -2 = (Ao) х e tok - 3.80X10²3 laolxe look 3 2.0.8 - ellook - 10k) : e on By taking logarithm on both side In (20.8) = 90k = K = 17/2018) = 3.03 3.4810 90

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