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Question

At 518C the rate of decomposition of a sample of gaseous acetaldehyde initially at a pressure of 363 Torr, was 1.00 Torr s1 when 5% had reacted and 0.5 Torr s1 when 33% had reacted. The order of the reaction is:

A
0.0
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B
2
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C
3
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D
1
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Solution

The correct option is B 2
r1r2=[ax1ax2]m
10.5=[0.950.77]m
2=(1.41)m
log2=m log(1.41)
log2log1.41=m
m=0.30100.149
~ 2

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