Question

The rate constant for a certain reaction is k = 4.40×10−3 s−1 . If the initial reactant concentration was 0.450 M, what will the concentration be after 3.00 minutes? Express your answer with the appropriate units

Answer 1

The rate constant for a certain reaction is k = 4.40×10−3 s−1 .

Since it has 1/s units, it must be first order, ( 1st) kinetics

so... apply

For first order

dC/dt = k*C^1

dC/dt = k*C

When developed:

dC/C = k*dt

ln(C) = ln(C0) - kt

If the initial reactant concentration was 0.450 M, what will the concentration be after 3.00 minutes? Express your answer with the appropriate units

ln(C) = ln(0.45) - (4.4*10^-3)(3*60)

C = exp(ln(0.45) - (4.4*10^-3)(3*60))

C = 0.20382 M