Question

Preview File Edit View Go Tools Window Help $ 88% Fri 4:10 AM Q E Screen Shot 2020-03-19 at 9.10.34 PM IQ Û Z @ Q Search Lab 2 - Rates of Chemica...eactions The rate of a certain reaction was studied at various temperatures. The table shows temperature (T) and rate constant (k) data collected during the experiments. Plot the data to answer the questions. What is the value of the activation energy, E, for this reaction? T(K) 1ks-1) 400 0.000369 420 0.00200 440 0.00928 Screen Shot 2020-0...29.60 PM 460 0.0377 0.136 Screen Shot 2020-0...09.08 PM 480 500 520 0.445 1.33 kJ. mol-1 540 3.64 Cultural Roots Reflection What is the value of the pre-exponential factor (sometimes called the frequency factor), A, for this reaction? 560 580 9.31 22.3 Screen Shot 2020-0...54.23 PM A = Screen Shot 2020-0....17.39 PM صورة من الأيميل المرسل آگه..ن : مرد

Answer 1

In Rate constant at 400K is k, =3.69 x 10-45-7 Rate constant at 420K is K, =2.00x10-25-1 T1 = 400K T = 420K Activation energy at two different temperatures can be calcualted by using the following equation: K, Eaſi 1] TK RT I, 2.00 x 10-5-?) Ea In -.Wx10 SI _ l_1 1 (3.69x10*5' 8.314x10ºkJK 'mole 400K 420K Ea I 20K 8.314x10ºkJK 'mole? _400KX420K 1.69x8.314x 10'kJK 'mole? x 400KX420K Ea = 20K =118kJ/mole Hence, activation energy for the reaction 118kJ/mole - - - - - - - - -- - - -- -- - -- - - - Activation energy, Ea=118 x 10 J/mol R=8.314JK 'mor? Temperature, T = 400K Use the following equation to calculate the frequency factor. K=Ae 118-10 Jmol 3.69x10-45+ =A e 3314JK mot <400K __3.69x10-451 3.85% 10-16 = 9.58x10 5- Hence, the frequency factor of the reaction is 9.58x10" 5?