Hydrogen gas and iodine vapor react as: H2(g)+ I2(g) → 2HI(g). The activation energy of the formation of HI is 1.03x102 kJ whereas the activation energy of the dissociation of HI is 1.77x102 kJ.  (a) Calculate the enthalpy of reaction for the reaction. (a) Sketch the energy profile for the reaction between hydrogen and iodine. Platinum acts as a catalyst for the reaction above. Sketch the energy profile  for the catalyzed reaction in the energy profile. (a) Name the type of catalysis involved and explain qualitatively how the presence of platinum catalyzes the reaction above

For the first-order reaction N2O5( g) → 2 NOzlg) + O{g) t12= 20.5 h at 20°C and 3.5h at 40°C. (a) Calculate the activation energy of this reaction. (b) If the Arrhenius constant A = 2.5 x 105s determine the value of k at 50°C. 1/2

The activation energy for a certain first order reaction is 139 kJ/mol. If the rate constant is 0.282 s at 12.4°C, what will the rate constant for the reaction be if the temperature is doubled? 0.564 s1 0.283 s1 (A) (B) (C) (D) (E) 0.361 s1 0.553 s1 3.22 s1

The activation barrier for the hydrolysis of sucrose into glucose and fructose is 108 kJ/mol. If an enzyme increases the rate of the hydrolysis by a factor of (7.07x10^0)E6, how much is the activation energy of the catalyzed reaction? Assume the frequency (A) factors for the catalyzed and the uncatalyzed reactions are identical and the temperature is 25 deg. C. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer units

What is the activation energy for a reaction if k = 1.89 × 10–1 s–1 at 541 Kelvin and k = 7.31 s–1 at 601 Kelvin, in kJ/mol? Report an integer value, without units.

The rate constant for the decomposition of a given ore is 0.0475 s-1. (a) what is the half-life of the ore? (b) how long (in s) is required för 56.5 % of the ore to decompose?

Given the following data for the reaction A → B, determine the activation energy, Ea, of the reaction. k (s−1) T (°C) 0.282 277 0.291 627

For the reaction of the ammonium ion with nitrous acid, the net reaction is NH4*(aq) + HNO2(aq) → N2(g) + 2H2O() + H*(aq) If the initial concentration of nitrous acid is 1.00 M and, after 28.8 s has elapsed, the concentration of nitrous acid has fallen to 0.82 M, what is the average rate of the reaction over this time interval? 0.0063 M/s 0.028 M/s -0.0063 M/s -0.028 M/s O 0.063 M/s

Hydrogen peroxide (H;O;) decomposes into water and awygen. H,O;(a9) + H0(1) + 1/2 0,(a) Ordinarily, this reaction proceeds rather slowty, but in the presence of some iodide ions (I ), the decomposition is much faster. The decomposition in the peesence of indide was studied at 20 C, and the data were plotted in various ways. Lise the graphs helow to answer the questions that follow. M (mol/L) 1/M (L/mal) 0. -0.5 0.14 06 -- 0.5 5- 044 -1.5- 0.3 3- 024 2- Tlme (s) Tlme (s) Tlme (s) 100 300 000 100 000 100 30 00 a What is the order of reaction for the decomposition of hydrogen peroxide? O zero-oder O first-onder Osecond-ceder b. Find the numerical value of the rate constant at 20'C, including the correct units. (Enter an uneounded value.) k= C. Cbeain an estimate of the initial rate of reaction in the experiment that penduced the graphs (i.e, the rate at = 0 in the graphs) (Enter an unrounded value.) rate = Jmol - L

Describe the effect of each of the following on the rate of the reaction of magnesium metal with a solution of hydrochloric acid: the molarity of the hydrochloric acid, the temperature of the solution, and the size of the pieces of magnesium.