9 - Chemical Kinetics Questions Answers

The half life period of a first order chemical reaction is 6.93 minuteĊŸ.The time required for the completion of 99% of the chemical reaction will be (log2=0.301)
Asked By: ROHIT SINGH 4 year ago
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A flask contains a mixture of compounds A and B. Both compounds decomposed by first order kinetics. The half lives are 54 minutes for A and 18 minutes for B. If the concentrations of A and B are equal initially, how long will it take for the concentration of A to be 4 time that of B?

Asked By: RAJIV 4 year ago
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decomposition of c2h5br (g) is a first order gaseous rxn . total pressure at end of rxn is 400mm. the %fraction of reactant undecomposed when total pressure is 300mm????

ans 50%

Asked By: SARIKA SHARMA 5 year ago
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The following data was obtaind for the vapour phase decomposition of ethylene oxide into methane and carbon monoxide at 414.5'c. t,min p,mm hg 0 116.6 5 122.56 7 125.72 9 128.74 12 133.23 18 141.37 show that the reaction is first order and calculate the rate constant.
Asked By: BIBHUTI BHUSAN PADHI 5 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

                      C2H4O -------------->           CO           +           CH4

          t                                          P (C2H4O)

         0                                          116.6

         5                                          116.6-[122.56-116.6] = 116.6-5.96 = 110.64

         7                                           116.6-[125.72-116.6] = 116.6-9.12 = 107.48

   similarly others then find k for different readings by first order equation. k will be same for all readings.

       

the radiation from a naturally ocuring radioactive substance as seen after deflection by a magnetic field in one direction are

(a) α rays

(b) β rays

(c) both (a) & (b)

(d) either α or β-rays

Asked By: HIMANSHU MITTAL 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

(d) because one will move opposite to the other

the amount of U-235 required per day to run a power house of capacity 50 MW (efficiency of nuclear reactor 75%. Assume energy liberated by fission of 1 U-235 atom is 200 Mev) is

(a) 15.8gm

(b) 28.1gm

(c)21.1gm

(d) none of these

Asked By: HIMANSHU MITTAL 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

let x gm is required

then according to the given condition 

(x/235)*6.023*1023*200*106*1.6*10-19 = 50*106*86400

solve

how can we find log and antilogs without the help of log and antilogs tablessad

Asked By: AVANTIKA PURI 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

there are methods but these are not good for all cases

 a ballon filled with ethane is pricked with a sharp point and quickly plucked into a tank of hydrogen at the same pressure , the ballone will have....          (1) eniarged , (2)collapsed ,  (3) remain unchanged in size  ,  (4) can't be predicted

 

Asked By: SHUBHAM VED 6 year agoSolved By: NIKHIL VARSHNEY
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two flasks A and Bcontain helium and hydrogen gases at 270C and 1 atm pressure. If volume of each vessel is 2L then flask B contains....

(1) The same number of atoms as in B , (2) same weight of gasas in B , (3) dubble the number of atoms asin  A  (4)half of the  number of atoms in A , ?

Asked By: SHUBHAM VED 6 year agoSolved By: NIKHIL VARSHNEY
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

answer by nikhil is correct 

in his answer Na represents avagadro number not sodium

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