# 5 - Chemical Kinetics Questions Answers

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.
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Joshi sir comment

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
Joshi sir comment

(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
Joshi sir comment

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 tables Asked By: AVANTIKA PURI
Joshi sir comment

there are methods but these are not good for all cases

## (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 Solved By: NIKHIL VARSHNEY
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Joshi sir comment

answer by nikhil is correct

in his answer Na represents avagadro number not sodium