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 0.00550 M in 100 s. The rate of appearance of O₂ for this period is __________ M/s.

Question

Quizplus · Accepted Answer

The rate of disappearance of NO₂ is (0.0100 - 0.00550) M / 100 s = 4.5 × 10⁻⁵ M/s. Since 2 moles of NO₂ produce 1 mole of O₂, the rate of appearance of O₂ is half the rate of disappearance of NO₂, which is 2.3 × 10⁻⁵ M/s.

Nitrogen Dioxide Decomposes to Nitric Oxide and Oxygen Via the Reaction