# 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. 👁 430
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

## Similar Questions

1. ### Chemistry

Q1. A 0.5 g mixture of Cu2O and CuO contain 0.425 g Cu. What is the mass of CuO in the mixture? Q2. A chemist wants to prepare 0.5 M HCl. The label of a commercial hydrochloric acid shows that S.G. =1.18 and concentration of HCl

2. ### calculus help thanks!

The gas law for an ideal gas at absolute temperature T (in kelvins), pressure P (in atmospheres), and volume V (in liters) is PV = nRT, where n is the number of moles of the gas and R = 0.0821 is the gas constant. Suppose that, at

3. ### chemistry

Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows: T(K) k(s^-1) 658....2.14*10^5 673....3.23*10^5 688....4.81*10^5 703....7.03*10^5 The activation energy is 1.02*10^2 kJ/mol.

4. ### chemistry.

Which hydrocarbon pair below have identical mass percentage of C? A: C3H4 and C3H6 B: C2H4 and C3H4 C: C2H4 and C4H2 D: C2H4 and C3H6 E: None of the above My answer is E...Can any one help me?

1. ### Chemistry

How many liters of oxygen gas at 153 degrees celsius and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride)

2. ### physics

A particle moving in simple harmonic motion passes through the equilibrium point x=0, 3 times per second. At t=0 its velocity at x=−0.0325m is negative. It travels 0.5m in a complete cycle. a) what is the phase constant in cm. i

3. ### 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

4. ### Chemistry

Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of H2O(g). C2H4(g) + H2O(g) C2H5OH(g) Kc = 9.0 × 103 [C2H4]eq = 0.015 M

1. ### Chemistry

The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O(g)==>N2(g)+O(g) . If the activation energy is 250 kJ/mol and the frequency factor is 8.0 x 1011 s-1, what is the rate constant for the

2. ### Chemistry

The equation for the complete combustion of ethene (C2H4) is C2H4(g) + 3 O2(g) ==> 2CO2(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mole O2, identify the limiting reagent. show all work.

3. ### chemistry

Given the following equations: 2 H2O2 (aq) → 2 H2O (l) + O2 (g) and C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (l) The first reaction is the decomposition of hydrogen peroxide into water and oxygen gas. The oxygen gas generated

4. ### Chemistry

how many C2H4 molecules are contained in 45.8 mg C2H4 when the molar mass of C2H4 is 28.05g/mol