# 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.
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

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

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

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