Question
Asked Nov 11, 2019
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P17B.5 The thermal decomposition of an organic nitrile produced the
following data:
t/(10's)
10.00 12.00
2.00 4.00 6.00 8.00
0
0.72 0.65
[nitrile]/(mol dm)
0.81
1.50 1.26 1.07 0.92
Identify the order of the reaction and calculate the rate constant.
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P17B.5 The thermal decomposition of an organic nitrile produced the following data: t/(10's) 10.00 12.00 2.00 4.00 6.00 8.00 0 0.72 0.65 [nitrile]/(mol dm) 0.81 1.50 1.26 1.07 0.92 Identify the order of the reaction and calculate the rate constant.

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Expert Answer

Step 1

From the given data, organic nitrile is an only reactant so rate of the reaction in each steps are,

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м Rate S In initial 1.50M 1.26 - 0.00063 M 1step 2000s 1.07 -= 0.00026M 4000s 2 step 0.92 -=1.5x10 M 3 step 6000s

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Step 2

From the rates, the order of the reaction is,

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0.00063M - 2 Rate 1 Rate 2 0.00026M order of reaction is 2* =2 0.00026M Rate 2 0.00015 M, T== Rate 3 order of reactionis 2* =2

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Step 3

From the given information rate constant is...

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0.693 K 0.693 0.693 =3.4x10s 2000s t

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