Nitrogen Dioxide Decomposes to Nitric Oxide and Oxygen Via the Reaction

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.

A) 0.35
B) 3.5 × 10^-3
C) 3.5 × 10^-5
D) 7.0 × 10^-3
E) 1.8 × 10^-3