The rate law for a hypothetical reaction is rate=k[A][B]. If the concentration of A and B are both 0.020 miles per liter and k = 1.3x10-1M-1s-1, what is the reaction rate

What you got here looks to be a plug-and-chug question

Note that mol/L = M

you know that

rate = k[a][b]

rate=?

k=1.3*10^-1 1/Ms

a=0.020 M

b=0.020 M

rate = (1.3*10^-1) (0.020) (0.020) = - - >the units cancel out to give you M/s

rate = 0.000052 M/s