calculate the delta h for the following reaction based on the given data. is cal

Question

calculate the delta h for the following reaction based on the given data. is calculate the delta h for the following reaction based on the given data. is calculate the delta h for the following reaction based on the given data. is JILLT-MILLS Activities and Due Dates Topic 15 Skills Practice Video E /26/2017 11:55 PM 2.71311/26/2017 04:03 PM Print CalculatorPeriodic Table stion 3 of3 Sapling Learning A reactant decomposes with a halif-life of 121 s when its initial concentration is 0 398 M. When the initial concentration is 0 654 M, this same reactant decomposes with the same half-life of 1214s What is the order of the reaction? 0 What is the value and unit of the rate constant for this reaction? 0.98 There is a hint available

Explanation / Answer

1)

since half life is constant and it doesn’t depend on the concentration, it is 1st order reaction

Answer: 1

we have:

Half life = 121 s

use relation between rate constant and half life of 1st order reaction

k = (ln 2) / k

= 0.693/(half life)

= 0.693/(121)

= 5.727*10^-3 s-1

Answer: 5.73*10^-3 s-1

2)

Rate depends on the slowest step

here 1st step is slowest

So, the rate law is:

rate = k[A][B]

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