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Question

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

ExperimentTime/s1Total pressure/atm100.421000.7

Calculate the rate constant.

(Given:log 4=0.602, log 3=0.477)

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Solution

In this case

k=2.303t logpi2pipt

=2.303100 log0.4(2×0.5)0.7=2.303100 log0.410.7

=2.303100 log0.40.3=2.303100 log1.33

=2.303100×0.1250.00288 s1

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