Question

55) The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.33 M? 56) The rate constant for a zero-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.33 M? 57) The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below. If the rate of appearance of Cr2(SO4)3 is 1.64 mol/min at a particular moment, what is the rate of disappearance of C2H60 at that moment? 2 K2Cr207 + 8 H2SO4 +3 C2H60 → 2 Cr2(SO4)3 + 2 K2SO4 + 11 H20 58) The rate constant, k, for a first-order reaction is equal to 4.2 x 10-4 5-1. What is the half-life for the reaction?

Answer 1

Answer or Given 5, -0.545' iný al concentrahon - a=0.33m Half life = ty For 1st order 0.693 ty = Ki tv, -0.693 - 1-283 sec 0-54 Rate constant = ko=0.54 Ši intial concentration =a=0.33M. ty=? for Zero order keachon tu - 0.33 -0023 = 0-305 sec 11-08 2x0.54

57) Given equation KSo + 1110 1 3 2C 8H 0 0 | 21 K, Cytgt.sg+ 3410 → (se} + aree + 1 1 이 = ACCI SAP '- Hd 22 DC218 - 2 t 1 2 DE > 6 을 -BCCHg) = 2-46mol/min DE & Rate of Disappearance of GHO = 2.46 mol/min 48) K = 42 x 5' 돌? t = 963 tv스 0693 = 0.165110d 딸고해 ty=1650 sec