Question

The rate constant for a second order reaction has the value of 2.5 x 10–3 L·mol–1·s–1. If the initial concentration of reactant is 3.5 mol·L-1, what will be the molar concentration of the reactant after 2.5 minutes?

Answer 1

[1/(A)] - [1/(Ao)] = kt
k is given in seconds; therefore, change 2.5 minutes to seconds.

Answer 2

I did that and but I got 1.52 mol/L rather 0.97 (as the answer key provides it)

Answer 3

I obtained 1.51 which is essentially the same as your answer. Did they give a reaction? The formula actually is
1/A - 1/Ao = akt so the a could change things but usually is not a number like 2/3. Must be a wrong answer. If you find to the contrary please be sure and post so I will know. However, I don't see anything wrong with what we've done.

Answer 4

No, they did not provide any reaction for this problem. If I'll find the solution, I'll post it here. Thank you for your help.