CHE 202-113 Exam 2 Feb 28 Spring 2018 12) 12) The decomposition of dinitrogen pe
ID: 712876 • Letter: C
Question
CHE 202-113 Exam 2 Feb 28 Spring 2018 12) 12) The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N20S(g) 4 Nogg) + O2(g) lf the rate of appearance of Op of disappearance of N20s at that moment? is equal to 2.40 mol/min at a particular moment, what is the rate C) 0.600 molmin D) 1.20 mol/min A) 4.80 mol/min B) 9.60 mol/min 13) When ethylene glycol, HOCH2CH20H, is added to the water in an automobile radiator, the 13) effect is to A) raise the boiling point and raise the freezing point. B) raise the boiling point and lower the freezing point. C) lower the boiling point and raise the freezing point D) lower the boiling point and lower the freezing point. 14) The first-order reaction, 2 N20g)-2 N2) 026), has a rate constant equal to 0.76 s-1 at 1000 14) K. How long will it take for the concentration of N20 to decrease from 1.0 M to .42 M. D) 0.88 s B)1.1s C) 24s A) 1.8s 15) 15) A plot of 1/BrO-1 vs time is linear for the reaction What is the order of the reaction with respect to the hypobromite ion, BrO-? B) 1 C)2 D) 3 A) 0 16) The decomposition of ozone in the stratosphere can occur by the following two-step mechanism: 16) BrO + O Br +02 Which species is a catalyst in this mechanism? A) BrO B) Br C)O D) O3 17) The hydrolysis of tert-butyl chloride is given in the reaction below: 17) crascoaq) + H2O (CH3)3OH(aq) + H+(aq) + C1-(aq) If the rate law is: Rate K(CH3)3CCIJ what is the order of the reaction with respect to water? A) zero B) first C) second D) thirdExplanation / Answer
12. 2N2O5(g) ---> 4NO2(g) + O2(g)
-1/2d[N2O5]/dt = +1/4d[NO2]dt = d[O2]/dt
d[O2]/dt = 1/2d[N2O5]/dt
d[N2O5]/dt = 2d[O2]/dt = 2*2.40mol/min
= 4.8mol/min
Option A