For the first order thermal decomposition reaction, the ...

CBSE Class 12 Chemistry 2016 Outside Delhi Set 1 Solved Paper

Question : 12

Total: 26

For the first order thermal decomposition reaction, the following data were obtained :
C2H5‌Cl(g)→C2H4(g)+HCl(g)

Calculate the rate constant
(Given : log‌2=0.3010,log‌3=0.4771, log‌4=0.6021)

Solution:

Given : Initial pressure,
P0‌=0.30‌atm
Pt‌=0.50‌atm
t‌=300 s
Rate constant, ‌k‌=‌

2.303

‌log‌

2P0−Pt

2.303

300 s

‌log‌

0.30

2×0.30−0.50

‌=‌

2.303

300 s

‌log‌

0.30

0.60−0.50

‌=‌

2.303

300 s

‌log‌

0.30

0.10

‌=‌

2.303

300 s

‌log‌3
‌=‌

2.303

300 s

×0.4771
‌=‌

1.099

300 s

‌=0.0036 s−1
‌=3.6×10−3 s−1

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