Answer to Question #162644 in Chemistry for James Jordan

Question

    The reaction   2A + 3B        C is first order with respect to A and B. When the initial concentrations are [A] = 1.6 x 10-2 M and [B] = 2.4 x 10-3 M, the rate is 4.1 x 10^-4 M/s. Calculate the rate constant of the reaction. (5 points)

Answer 1

According to the equation:

r = k[A]^a[B]^b

where r - reaction rate, k - rate constant, [A] and [B] - concentrations of compounds A and B, a and b - order of the reaction.

From here, the rate constant of the reaction is:

k = r / [A]^a[B]^b = 4.1 × 10^-4 M/s / [(1.6 × 10^-2 M)¹ × (2.4 × 10^-3 M)¹] = 10.7 M^-1 s^-1

Answer: 10.7 M^-1 s^-1