how do i solve the following problem?

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction:

2NO2 → 2NO + O2

In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of
Disappearance of NO2 for this period is __________ M/s.
3.5x10^-5 is supposedly the answer, but how do i get to that answer?

2 answers

(0.0100-0.00650)/100 =
(.1M-.0065M)/(100sec)=3.5e-5
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