# Homework Help: Finding change in concentration over change in time

1. May 2, 2010

### Greywolfe1982

1. The problem statement, all variables and given/known data

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]
$$\Delta$$t

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

2. Relevant equations

C = n/v
...?

3. 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?

2. May 5, 2010

### Staff: Mentor

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.

--
methods

3. May 6, 2010

### Greywolfe1982

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