7. The rate law for the reaction A+3B-→C+2D_was found to be v=k,AB. What are the units of the rate constant? Express the rate law in terms of the rates of formation and consumption of (a) A, (b) C. dae boo Sw anilulo 2nsioittooo VIvioe to 2rrot ni nnixitg to va1sn9 d lom xim

[4] The reaction: 21 (aq) + S2O;²-(aq) → I½(aq) + 2SO,²-(aq) is first order with respect to I and first order with respect to S20g. The rate constant k was determined at different temperatures and a plot of In(k) versus 1/T was constructed resulting in the straight line: y = -5781.8x + 14.1. Assume k has units of M's. (a) Determine the activation energy for this reaction. (b) Calculate the value of k at 20 °C.

The decomposition of nitrosyl chloride was studied: a. What is the rate law? b. Calculate the value of the rate constant. c. Calculate the value of the rate constant when concentrations are given in moles per liter.

Consider the reaction described by the equation С,Н, Br, (aq) + 31 (аq) — C,H,(g) + 2 Br¯(aq) + I, (aq) 4 The rate law is rate = k[C,H,Br, ][I¯] where k = 0.00483 M-1. s-1. What are the missing entries in the table? Run [C,H,Br, lo (M) | [I¯]o (M) Initial rate of formation of C,H, (M-s ) 4 1 0.299 0.00173 2 0.299 y 0.000864 3 0.299 0.299

1

Time left 0 If the rate law for the reaction 2A + 3B - products is first order in A and second order in B, then the rate law is rate = O a k[AJ°[B}? O b. k(AJ[B) Oc KLAP(B] O d. KLAJ[B]

5. The reaction A →B+C is known to be first order in A. Below are data showing the concentration of A as a function of reaction time. Time, min [A], M 5.00 x 10-2 4.30 x 10-2 5 10 3.70 x 10-2 2.74 x 10-2 1.51 x 10-2 20 40 1.12 x 10-2 8.26 x 10-3 50 60 (a) What is the average rate of reaction between 5 and 20 min? Report the units as well as the numbers. (b) Plot the data above, showing the concentration of A as a function of the time. From your graph, determine the instantaneous rate of reaction at 40 min. Report the units as well as the numbers. (c) Plot In [A] versus time. Estimate the rate constant for this first-order reaction from your graph. Report the units as well as the numbers.

3. An experiment was carried out to determine the rate law for the following reaction: 19152 2NO( )+0( ) → 2NO( ) Where the rate law is: par Rate = k[NO] [0] The experiment was repeated three times and the following data recorded: Experiment # Initial [NO] (M) Initial [0] (M) Rate (M/s) 1 ullo2 M0.015 0.015 2 0.030 0.015 3 0.015 0.030 of in Determine the value of x in the rate law (order of reaction with respect to NO) by comparing experiments 1 and 2 in Equation 13 reaction with respect to O₂) by comparing experiments 1 and 3 in equation 13. 0.048 0.192 0.096

4. What is the value of x, the order of the reaction with respect to [OH']? k'/k" = (1/0.5)* 5. What is the value for the rate constant, k? k= k'/1* = %3D k =k"/0.5*= SaD 6.

Concentration-Time Relationships (See Section 15.4 and Examples 15.5-15.7.) 15. The rate equation for the hydrolysis of sucrose to fruc- tose and glucose CRH2O1(aq) + H¿O(€) → 2 C,H12O6(aq) is -A[sucrose]/At = k[C¡2H2O1]. After 27 minutes %3D at 27 °C, the sucrose concentration decreased from 0.0146 M to 0.0132 M. Find the rate constant, k.