Please help I'll give you a medal if you answer right
The rate law for a hypothetical reaction is rate = k [A][B]. If the concentrations of A and B are both 0.020 moles per liter and k = 1.3 × 10-1 M-1s-1, what is the reaction rate?

4.0 × 103 M

1.3 × 10-1 M-1s-1

5.2 × 10-5 Ms-1

5.2 × 105 Ms-1

Question

Please help I'll give you a medal if you answer right
The rate law for a hypothetical reaction is rate = k [A][B]. If the concentrations of A and B are both 0.020 moles per liter and k = 1.3 × 10-1 M-1s-1, what is the reaction rate?

4.0 × 103 M

1.3 × 10-1 M-1s-1

5.2 × 10-5 Ms-1

5.2 × 105 Ms-1

taramgrant0543664 · Answer

5.2x10-5

photon336 · Answer

You have k[a][b] = r

You know that your concentration of a = b so that's 0.020 M

(0.020)(0.020) M*M = 4x10^-4 M^2

4x10^-4 M^2*(1.30x10^-1)M^-1s^-1 =

5.2x10^-5 M s^-1 which is your answer.