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+1 vote
5.6k views
in Chemical kinetics by (79.8k points)
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The decomposition of N2O5 according to following reaction is first order reaction 

2N2O5 (g) 4NO2 (g) + O2 (g)

After 30 min. from start of the decomposition in a closed vessel, the total pressure developed is found to be 284.5 mm of Hg and on complete decomposition, the total pressure is 584.5 mm of Hg. Calculate the rate constant of the reaction. 

1 Answer

+2 votes
by (76.1k points)
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Best answer

2N2O5 (g) 4NO2 (g) + O2 (g)

2N2O5 4NO2 O2
P0 0 0
P0 – 2x 4x x

P0 : initial pressure ; Let Pt : pressure at 30 min and P : pressure at the end of decomposition. 

A0 : initial concentration ; A : final concentration

by (10 points)
+1
Why you divided it by 2??
by (50.4k points)
+1
we have to calculate for 30 min

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