Finding change in concentration over change in time

[Greywolfe1982]

Homework Statement

At a certain temperature, the reaction 2NO2(g) --> 2NO(g) + O2(g) progresses in a 4.00 liter vessel at a rate of 0.88 mol · L⁻¹· s⁻¹. What is

\Delta[NO2]
\Deltat

under these conditions?
Answer in units of mol · L⁻¹· s⁻¹.

Homework Equations

C = n/v
...?

The Attempt at a Solution

I'm not at all sure where to start with this one. My only work with mol/Ls was finding the rate that a product was made compared to the reactant. Could I get a starting point?

 

[Borek]

Honestly, I have no idea what the question is about. The way you worded it you are asked about speed and you are told what the speed is. Seems to me like the answer is just 0.88 mol L^-1 s^-1.

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methods

 

[Greywolfe1982]

Bleh, that was too simple. All you had to do was double it due to the mole ratio.