aion ol tne reactionE17B.3(b) The rate constant for the first-order decomposition of a compoundA in the reaction 2 A-> P is k. 3.56 x 10s at 25 °C. What is the half-lifeof A? If the initial partial pressure of A is 33.0 kPa, what will be its partialpressure (i) 50 s, (ii) 20 min after initiation of the reaction?

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Asked Nov 18, 2019
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aion ol tne reaction
E17B.3(b) The rate constant for the first-order decomposition of a compound
A in the reaction 2 A-> P is k. 3.56 x 10s at 25 °C. What is the half-life
of A? If the initial partial pressure of A is 33.0 kPa, what will be its partial
pressure (i) 50 s, (ii) 20 min after initiation of the reaction?
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aion ol tne reaction E17B.3(b) The rate constant for the first-order decomposition of a compound A in the reaction 2 A-> P is k. 3.56 x 10s at 25 °C. What is the half-life of A? If the initial partial pressure of A is 33.0 kPa, what will be its partial pressure (i) 50 s, (ii) 20 min after initiation of the reaction?

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Expert Answer

Step 1

The term first order reaction is defined for those reactions which proceed at a rate that has a linear dependence on the concentration of only one reactant.

Step 2

The half-life of a given reaction can be defined as the time in which the initial concentration of the reactants reduces to half of its original value. Mathematically it can be represented as follows:

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In 2 0.693 t,2 where k is the first order rate constant

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Step 3

For the given reaction, the first order rate constant is given to be 3.56×10-7 s-1.

T...

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In 2 0.693 1/2 k k 0.693 3.56x10's 1.94x10's

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