The data shown were collected for the decomposition of acetaldehyde, CH3CHO (used in the manufacture of a variety of chemicals including perfumes, dyes, and plastics), into methane and carbon monoxide. The data were collected at a temperature of 530°C.
CH3CHO CH4 + CO
[CH3CHO] (mol L-1)
0.200
0.153
0.124
0.104
0.090
0.079
0.070
0.063
0.058
0.053
0.049
Time (s)
0
20
40
60
80
100
120
140
160
180
200
Make a graph of concentration versus time, and use it to answer the questions.
What is the rate of reaction of CH3CHO after 60 seconds, expressed in units of mol L-1 s-1?
What is the rate of reaction of CH3CHO after 120 seconds, expressed in units of mol L-1 s-1?
Answer:
rate after 60 secs =(0.2- o.104)/60
rate after 120 secs=(0.2-0.070)/120
So all you need to do is make a graph of these points with the concentration on the y-axis and the time on the x-axis. Once you graph these, if you find the slope at 60 and 120 seconds, that will give you the rate at those times.
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