Question

Ignore my wriitng. im just confused as to how to fill in this table?

Foundations of Chemistry IB- November 2014 SECTION E. ANSWER IN A SEPARATE BOOK Question 1 The thermal decomposition of nitrogen dioxide, 2NO2 2NO)+O2(@) was carried out in a 2 L container initially containing only the reactant. The following table lists the measured data NOA time (s) NO2 (mol) [NO2 (M) O2 (mol) [02] (M) 0 3.0 1.2 0.20 A2S OP6 150 300 Redraw the last three columns of the table in your answer booklet and complete the missing (a) entries in the table. [3 marks] Calculate the rate of reaction with respect to (i) the rate of consumption of NO2 over the time (b) interval from 0 to 150 s, and (ii) the rate of production of O2 over the time interval from 150 to 300 s [2 marks] (c) The amount of NO2 in the reaction vessel was monitored by visible spectroscopy. Describe how its visual appearance changes with time. Note that NO and O2 are colourless. [I mark] 2N

Answer 1

2 NO, ND + 0 aschdiny to R 2 males No, t8) en decomposition ies mel of 18). ie Ratio is 2:1 No:0) ACtrt t-0 3.0 ma t150 1.2 0.9 t:300 0 20 2-8 g'4 En ittaliy t-o mler Na 3 2 =1. 2 te150 ie males of N decompa.sed 3-1.2 1.8 meles al 02 formed 1.8 17 O.9 2 t- 300 molo No, decompred 3-0.2o : 2.8 2 8 1.4 mola ol be formed 17 2 mo. o1 miles Vol l soln malan't 11 ; molavity of 0J L 2 t = 150 DI7 mall 1.4 2 t 300

(a)time NO, (mel) 0, Cmal) No,) (M) 1 '5 0 3.0 0.45 150 0.9 12 300 0.7 0:20 J4 rate ot x st decompasihon of No over tin t 0 150 -PPND P e Conc. o1 No2 t IS0)- cont ol Noz 1feo 1 So-0 6-9 1.5 150 Lx0.9 mol/ 150 2.57X103 m/s (Irate of Produet ten of 02 fron t-150-300 P Cont-of 0 Ct- 300)- cone of 02 (t s0) (300-1SD )A

o7-0.45) mol / O. 25 150 3 66 X 10 mel /a-s