Find the rate of the reaction when the concentrations of A and B are, respectively, 0.1 M and 0.15 M

Question

A student performed a chemical reaction which involved one mole of A reacting with 2 moles of B to form one mole of product C.

This reaction is 0 order for A and first order for B. The initial rate of the reaction is 1.2 M/s when both initial concentrations of reactants are 0.2 M.

1. Determine k (include units)
2. Find the rate of the reaction when the concentrations of A and B are, respectively, 0.1 M and 0.15 M.

Answer 1

A + 2B ==> C

(1)

rate = k[B]

1.2 M/s = k(0.2 M)

k = 6 s^-1

(2)

rate = k[B]

rate = 6 s-1 x 0.15 M

rate = 0.9 M/s