Question

88 Uing the graph from Problem 13.54, determine how long it takes for the CH,CHO concentracion to decrease from 0.200 mol L to 0.100 mol L. How long does it take the concentration to drop from 0.100 moi L to 0.050 mol LWhat is the order of this reaction? (Hint: How is the half-life telated ro concentration?) 13.54 The following data were collected for the decomposition f acetaldehyde. CH,CHO, (used in dhe imanafacture of a yatiety of chemicals including perfumes, dyes, and plas- tics), Into methane and carbon manoxide. The data were collected at 535 °C CH,CHO CH,+ CO ICH CHO (mat Time s O 0.200 0.153 0.20 x 102 0.40 x 102 0.60 x 10 0.80 x 10 0.124 0.104 0.090 0.079 1.00 x 10 0.070 1.20 x 10 1.40 x 1o 1.60 x 10 1.80 x 10 2.00 x 102 0.063 0,058 0.053 0 049

Answer 1

30 25 Data Trendline 20 15 10 trendline equation 5 y4.9879+ 0.0771 x 0 75 125 25 50 100 150 175 200 Time (s) 1/ [CH CHO]

plOT of STRAGHT INE . 0.0741 n TREND AINE IS EQUATION 04.9819 tt S SECOND ORDER REACTIO N kt SECOND ORDER fOR REACHON A SlopE RATE CONS, k = 0.01H mo L S kA1, 1 x0.200 MK L 0.01H met imE REPUIRTD FOR 0.20 ma O.100 mot FALL TO TO x0 l00 m L O.0 tI mo'JS TimE REQUIRO FoR O 100 moe L 0.05D m T. 130 s to FAle TO