Posted by **cara** on Sunday, February 6, 2011 at 6:11pm.

The following data are obtained for the decomposition of N2O5 at a certain temperature:

2N2O5(g)↔4NO2(g) + O2(g)

Time(s) 0 200 400 600 800

N2O5 (atm) 2.10 1.85 1.63 1.43 1.26

Find the rate constant kobs for this first-order decomposition reaction in sec-1

So far I have two equations that I think are needed: ln([At]/[Ao])=-kt and PV=nRT but how to proceed?

- College Chemistry -
**DrBob222**, Sunday, February 6, 2011 at 11:40pm
I believe you need to plot the data and determine the slope of the straight line. Plot ln A vs time.

- College Chemistry -
**cara**, Tuesday, February 8, 2011 at 9:58pm
But A stands for concentration..how would i obtain it from the data given?

- College Chemistry -
**jen**, Wednesday, February 9, 2011 at 11:23pm
Consider a .0500m solution.HClO2such that36% of the molecules dissociated when dissolved in water. Calculate the vant Hoff factor for this solution is hclo2 is36% associated

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