Chemistry

For the gas phase decomposition of chloroethane,

CH3CH2Cl C2H4 + HCl

the rate constant at 723 K is 1.75E-4 /s and the rate constant at 769 K is 2.19E-3 /s.

The activation energy for the gas phase decomposition of chloroethane is

  1. 👍 0
  2. 👎 0
  3. 👁 205
  1. USe the combined arrehiuns equation and solve for Ea:

    ln(k1/k2 )=Ea/R(1/T2−1/T1)

    Where

    k1=1.75 x 10^-4
    T1=723K
    k2=2.19 x 10^-3
    T2=769K
    R= 8.314 J/mol*K
    And
    Ea=?

    ln(1.75 x 10^-4/2.19 x 10^-3 )=Ea/8.314 J/mol*K(1/769K−1/723K)

    -2.5269=Ea/8.314 J/mol*K(-8.2736 x 10^-5)

    -2.5269/-8.2736 x 10^-5=Ea/8.314 J/mol*K

    3.054 x 10^4=Ea/8.314 J/mol*K

    Ea=3.054 x 10^4*8.314 J/mol*K

    Ea=2.54 x 10^5 J/mol

    1. 👍 0
    2. 👎 0
    posted by Devron

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The rate constant for the decomposition of acetaldehyde, CH3CHO, to methane, CH4, and carbon monoxide, CO, in the gas phase is 1.59 ✕ 10−2 L/mol/s at 711 K and 3.63 L/mol/s at 855 K. Determine the activation energy (in

    asked by Jamie on September 10, 2017
  2. Chemistry- Kinetics

    2. At 600 K the decomposition of gas ohase nitroethane (CH3CH2NO2) is first order with a rate constant of 1.9*10^-4 s^-1. CH3CH2NO2 --> C2H4 + HNO2 a) Write out the differential and integrated rate laws for this reaction. b) If a

    asked by Tasneem on April 7, 2012
  3. Chemistry

    1. The decomposition of acetaldehyde is a second order reaction with a rate constant of 4.71 × 10^−8 L/mol/s. What is the instantaneous rate of decomposition of acetaldehyde in a solution with a concentration of 5.55 × 10^−4

    asked by Bob on April 11, 2017
  4. Chemistry

    The electrolysis (decomposition) of water produces hydrogen gas at the rate of 30.0 mL/min. A) Write a balanced chemical equation for this reaction and include phase designations. 2H2O(aq)---> 4H2(g)O2(g) Is whatever I've done

    asked by Anonymous on October 11, 2010
  5. Chemistry

    The gas phase decomposition of dinitrogen pentoxide at 335 K N2O5(g) 2 NO2(g) + ½ O2(g) is first order in N2O5. During one experiment it was found that when the initial concentration of N2O5 was 0.218 M, the concentration of N2O5

    asked by Breauna on January 24, 2014
  6. Chemistry

    Given the following equations, calculate the ΔH of reaction of ethylene gas (C2H4) with fluorine gas to make carbon tetrafluoride (CF4) gas and hydrogen fluoride gas. Show your work. H2 (g) + F2 (g) → 2HF (g) ΔH = –537 kJ C

    asked by student on April 18, 2019
  7. chemistry

    A puncture in the tubing of a refrigerator can cause severe frosbite as chloroethane C2H5Cl, vaporizes. Use this thermochemical equation to calculate the heat absprbed when 23.6g of chloroethane vaporizes at its boiling point

    asked by Ted on November 19, 2012
  8. chemistry kinetics

    Decomposition of an organic compound A follows first order kinetics. Initial concentration of A is 2 M. If rate constant of the decomposition is 3.58 × 10^−6 min^-1 , calculate the rate after 3 hours.

    asked by swa on May 24, 2012
  9. Chemistry

    An excited ozone molecule, O3*, in the atmosphere can undergo one of the following reactions, O3* → O3 (1) fluorescence O3* → O + O2 (2) decomposition O3* + M → O3 + M (3)deactivation, where M is an inert molecule, the rate

    asked by Anonymous on December 5, 2015
  10. Chemistry

    An excited ozone molecule, O3*, in the atmosphere can undergo one of the following reactions, O3* → O3 (1) fluorescence O3* → O + O2 (2) decomposition O3* + M → O3 + M (3)deactivation, where M is an inert molecule, the rate

    asked by Anonymous on December 7, 2015

More Similar Questions