February 25, 2017

Homework Help: Chemistry

Posted by Dena on Tuesday, November 10, 2009 at 1:36pm.

I've tried this problem over and over again, but im not getting the right answers! This is the problem.......

Dinitrogen pentoxide, N2O5, decomposes when heated in carbon tetrachloride solvent.
N2O5 ¨ 2 NO2 + 1/2 O2(g)

If the rate constant for the decomposition of N2O5 is 6.2 10-4/min, what is the half-life(in Minutes)? (The rate law is first order in N2O5.)
How long would it take for the concentration of N2O5 to decrease to 6.250% of its initial value(in minutes)?
How long would it take to reach 0.8% of its initial value(in minutes)?
Can anyone help me? Thank You!!!

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