Define the terms rate constant k and halflife as used in chemical kinetics . Wha

Question

Define the terms rate constant k and halflife as used in chemical kinetics . What is the half - life of a reaction A + B- > C.
[a]=45 [b] =0.5 k=12

For the reaction : A + B- > C.
Calculate the second order reaction rate constant it ' [ A ]=1.0 M. [B] = 12 M , and after 28 s concentration of [ A ] = 0.46

For the first - order reaction N2O - > N2 +O
Activation energy is 301 kj/mol . The half - life of the dinitrogen oxide is 5.8e6 sec at 468 ° C . What will it be at 565 ° C ?

If an activation energy for l reaction is 60 kJ / mole and for the Il reaction an activatin energy is 30 kJ / mole . Which of the following statements must be correct ?
( a ) At the same temperature the rate of reaction ll is greater than the rate of reaction I.
( b ) The energy of reaction II must be greater than the energy of reaction I
( c ) The energy of reaction I must be greater than the energy of reaction II
( d ) If reaction I is exothermic and reaction II is endothermic then reaction l is favored kinetically
( e ) The rate of reaction 1 at 25 ° C equals the rate of reaction 11 at 50 ° C

i. Decme thea-ms tale A!nsattaid iir-lise its use. In chemical kiralia, whuisite half-ide oc a rezctcn A+ R C, 2. For the reena All, C Colcuine the secullamrl:r rezaioc fule Liolin ital! 1 .G M, jub-12 M, and 3. For the linerar action: ictivu:all ercy. is in i k) ma I he half lite ofe diilieee aside i-c 8-1 r s-31 rgy ia in kImatle, whre, :,-h., gulowng s121e111A.> rTAMINe cer::et'y ial the same tempenn in the rare el rea.: is L-wrek ai ile me of recline i. t by Lhe ete: ke of.coccon LI uiLol le e-e s li r ihin the eleve of rectio. I 2) nc enLTgyerra-li a1ethe grean hu Ihe energy of rewikal II The ne oricacli:n 1 #2SC ecuala Lhe ral: uf na.enU sec

Explanation / Answer

Rate constant : This is a proportionality constant which relate the rate of a reaction at a particular temperature with concentration fo the reactant or product of the concentration of the reactant

Half life : Time required by a substance to reduce to half of its inital value.

As the concentration of A is very high compared to B, change in concentration a thoughtout the reaction can be considered as constant. So that the reaction becomes unimolecular. This type of reactions are known as pseudo unimolecular reactions.

t1/2 = 0.693/k = 0.693/12 =0.058 sec

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