Problem 12.50 The initial rates listed in the following table were determined fo

Question

Problem 12.50 The initial rates listed in the following table were determined for the reaction A+2B+C-Products Experiment Initial Initial Initial Initial Rate of Consumption of A(M/s) 10 0 12 0050 60 x 10 3 2 0.10 No 24 0015 1.2x10 o 10 No 36 050 1.8 x 10 2 4 20 o 36 0.050 7.2 x 10 Rate k AIB) Rate klAPIB) i Rates klAJIBP Submit My Answers Give Up Correct Part B What is the value of the rate constant including the proper units? Express your answer to two significant figures and include the appropriate units. 100 Submit My Answers Give um Incorrect Try Again: 2 attempts remaining Enter your answer using dimensions of rate constant units for third-order reaction Part C What is the initial rate when the initial concentrations of all three reactants are 50- 10 M? Express your answer to two significant figures and include the appropriate units. lalue Units

Explanation / Answer

From the kinetics data given,

Part B) rate constant k = rate/[A]^2.[B]

= 6 x 10^-3/(0.1)^2.(0.12) = 5 M^-2.s^-1

Part C) Initial rate when concentration of [A] = [B] = 5 x 10^-2 M

rate = 5 x (5 x 10^-2)^3 = 6.25 x 10^-4 M/s

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