Chapter 14 Homework Answers

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1 Chapter 14 Homework Answers The slope of the tangent to the curve at each time is the negative of the rate at each time: Rate 60 = mol L 1 s 1 Rate 120 = mol L 1 s From the coefficients in the balanced equation we see that, for every mole of B that reacts, 2 mol of A are consumed, and three mol of C are produced. This means that A will be consumed twice as fast as B, and C will be produced three times faster than B is consumed. rate of disappearance of A = 2( 0.30) = 0.60 mol L 1 s 1 rate of appearance of C = 3(0.30) = 0.90 mol L 1 s We rewrite the balanced chemical equation to make the problem easier to answer: N 2 O 5 2NO 2 + 1/2O 2. Thus, the rates of formation of NO 2 and O 2 will be, respectively, twice and one half the rate of disappearance of N 2 O 5. rate of formation of NO 2 = 2( ) = mol L 1 s 1 rate of formation of O 2 = 1/2( ) = mol L 1 s (a) 1 d[ph 3] d[p 4] 1 d[h 2] = = 4 dt dt 6 dt (b) Rate = 1 (0.34) M s 4 1 = M s -1

2 14.55 rate = ( L mol 1 s 1 )( mol/l)( mol/l) rate = mol L 1 s Rate = k[rn] = s -1 x 1.0 x 10-9 mol L -1 = 1.25 x M s Compare the data of the first and second experiments, in which the concentration of NO is held constant and the concentration of O 2 is increased by a factor of 4. Since this caused a rate increase by a factor of 28.4/7.10 = 4 1, we conclude that the order of the reaction with respect to O 2 is one (case number six in Table 14.4). In the second and third experiments, an increase in the concentration of NO by a factor of 3 (while holding the concentration of O 2 constant) caused a rate increase by a factor of 255.6/28.4 = 9. This is the eighth case in Table 14.4, and the order is seen to be two. rate = k[o 2 ][NO] 2 We can use any of the three sets of data to solve for k. Using the first data set gives: 7.10 mol L 1 s 1 = k[ mol/l][ mol/l] 2 k = L 2 mol 2 s Since it is the plot of 1/conc. that gives a straight line, the order of the reaction with respect to CH 3 CHO is two. The rate constant is given by the slope directly: k = M 1 s = kt [ A] [ A t ] = L mol s x t M 0.25 M t = 65 s Since 1/2 of the Sr 90 decays every half life, it will take 5 half lives, or 5 28 yrs = 140 yrs, for the Sr 90 to decay to 1/32 of its present amount.

3 14.85 Using equation 14.9 we may determine how long it has been since the tree died. t ( ) ro ln = t where r = 1.2 x 10 r 4 12 o 4 ( ) ln = t Taking the natural log we determine: t = ln = yr The graph is prepared exactly as in example of the text. The slope is found using linear regression, to be: K. Thus K = E a /R E a = ( K)(8.314 J K 1 mol 1 ) = J/mol = 139 kj/mol Using equation we have: k2 Ea 1 1 ln = k1 R T2 T Ea L mol s 1 1 ln = L mol s J mol K 503 K 478 K K = E 1 1 a J mol K E a = J/mol = 138 kj/mol Substitute into the equation: k2 Ea 1 1 ln = k1 R T2 T k J mol 1 1 ln = s J mol K 318 K 308 K ln(k 2 / s 1 ) = 1.33 k 2 = s 1 exp(1.33) = s 1

4 14.97 An intermediate is formed in one step of a mechanism and then used in another step. Intermediates in this mechanism are Cl and CCl 3 Sum the three steps to obtain the overall, balanced equation for the reaction. Cl 2 (g) + CHCl 3 (g) HCl(g) + CCl 4 (g) The rate law is obtained from the slow step. Rate = k[cl][chcl 3 ] However, Cl is an intermediate and does not occur in the overall reaction. To obtain a rate equation in terms of reactants or products we need to replace [Cl]. From the first step, K eq = 2 [ Cl] [ Cl ] 2 { } 1/2 eq 2 [ Cl ] = K [ Cl ] 1/2 { [ ]} [ ] 1/2 1/2 [ ] [ ] ' 1/2 eq 2 3 eq 2 3 [ 2 ] [ 3 ] Rate = k K Cl CHCl = kk Cl CHCl = k Cl CHCl k = 0.693/12.5 y = y ( ) 1 ln = y t 0.1 t = 41.6 y Reaction is exothermic

5 (a) The reaction rate is first order so as the concentration of reactants triples the rate will triple. (b) The reaction rate is second order so as the concentration of reactants triples the rate will increase by a factor of nine. (c) The reaction rate is zeroth order so the rate is independent of concentration. There is no change in the rate. (d) The reaction rate is second order so as the concentration of reactants triple the rate increases by a factor of nine (e) The reaction rate is third order so as the concentration of reactants triple the rate increases by a factor of twenty seven (a) rate = k 1 [A] 2 (b) rate = k 1 [A 2 ] 1 (c) rate = k 2 [A 2 ] 1 [E] 1 (d) (e) 2A + E B + C The rates for the forward and reverse directions of step one are set equal to each other in order to arrive at an expression for the intermediate [A 2 ] in terms of the reactant [A]: k 1 [A] 2 = k 1 [A 2 ] k1 [A 2 ] = [A] 2 k 1 This is substituted into the rate law for question (c) above, giving a rate expression that k is written using only observable reactants: rate = k 1 2 [A] 2 [E] 1 k To solve this problem, plot the data provided as 1/T vs 1/t where T is the absolute temperature and 1/t is proportional to the rate constant. t (min) T (K) 1/T ln(1/t)

6 The slope of the graph is equal to E a /R, therefore: 7,704 = E a /R 7,704R = E a 7,704 K(8.314 J/mol K) = E a E a = 64,050 J/mol E a = 64 kj/mol From the straight line equation, we can determine the time needed to develop the film at 15 C is 14 min (a) The first step, in which a free radical is produced, is the initiation step. (b) (c) Both the second and third steps are propagating steps since HBr, the desired product, and an additional free radical are produced. The final step in which two bromine free radicals recombine to give a bromine molecule is the termination step. The presence of the additional reaction step serves to decrease the concentration of HBr.

[ A] 2. [ A] 2 = 2k dt. [ A] o

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