Kinetics Homework Help: N2O5 Decomposition @ 70°C

[youxcrushxme]

Hi everyone

I need some help with this problem -

The first order rate constant for the decomposition of N2O5 at 70 degrees celsius is 6.82x10-3 s-1

2N2O5 -> 4NO2 +O2

Suppose we start with 25 mmol of N2O5 in a volume of 2L. How many mmol of N2O5 will remain after 2.5 min?

I'm not sure about what formula I should be using for this. Any help would be appreciated :)

 

[gradeaswimr]

http://www2.wwnorton.com/college/chemistry/gilbert/concepts/chapter14/ch14_3.htm#2