Kinetics Homework Help: N2O5 Decomposition @ 70°C

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The decomposition of N2O5 at 70°C follows first-order kinetics with a rate constant of 6.82 x 10-3 s-1. Starting with 25 mmol of N2O5 in a 2L volume, the remaining concentration after 2.5 minutes can be calculated using the first-order rate equation. After applying the formula, approximately 10.5 mmol of N2O5 will remain after the specified time period.

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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 :)
 
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