13. The decomposition of phenyldiazonium chloride in water was studied by measuring the pressure. The following experimental data were obtained:
t, s 0 90 270 810 1620 2640 3600 5100 
R mmHg st 22.62 21.80 20.23 15.99 11.41 7.40 4.88 2.62 0
Determine the reaction order by the integral method (substitution method and graphical method), reaction rate constant and half-life.

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