CBSE Class 12 Chemistry 2014 Outside Delhi Set 1 Solved Paper

Question : 20

Total: 30

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume:
SO2Cl2(g)→SO2(g)+Cl2(g)

Experiment	Time /s−1	Total pressure/atm
1	0	0.4
2	100	0.7

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

Solution:

SO2Cl2(g)→SO2(g)+Cl2(g)

At‌t=0	P0	0	0
At‌t=100‌sec	P0−P	P	P

P0‌=0.4‌atm
P0−P+P+P‌=0.7‌atm
P0+P‌=0.7‌atm
P‌=0.3‌atm
It's a first order reaction.
‌K=‌

2.303

‌log‌

P0−P

‌K=‌

2.303

‌log‌

0.4

0.1

So, the rate constant, K=1.39×10−2 sec−1

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