1. The activation energy for the gas phase decomposition of chloroethane is 254 kJ. CH3CH2Cl--->C2H4 +...
1. The activation energy for the gas phase
decomposition of chloroethane is
254 kJ.
CH3CH2Cl--->C2H4
+ HCl
The rate constant at 750 K is
7.99×10-4 /s. The rate constant will be
5.61×10-3 /s at_____ K
2.
The activation energy for the gas phase
decomposition of chloroethane is
254 kJ.
CH3CH2Cl--->C2H4
+ HCl
The rate constant at 756 K is
1.09×10-3 /s. The rate constant will
be___ /s at 786 K.
Homework Answers
1. Ea = 254KJ = 254000J
K1 = 7.99*10^-4 /S
T1 = 750K
K2 = 5.61*10^-3 /S
T2 =
log(K2/K1) = Ea/2.303*R [ 1/T1 - 1/T2]
log(5.61*10^-3/7.99*10^-4) = 254000/2.303*8.314 [ 1/750 - 1/T2]
0.846 = 13265.6[ 1/750 - 1/T2]
[ 1/750 - 1/T2] = 0.846/13265.6
[ 1/750 - 1/T2] = 6.37*10^-5
[ 0.00133 - 1/T2] = 0.0000637
-1/T2 = 0.0000637-0.00133
-1/T2 = -0.0012663
T2 = 1/0.0012663
T2 = 789.7K
2.
Ea = 254KJ = 254000J
K1 = 1.09*10^-3 /S
T1 = 756K
K2 =
T2 =786K
log(K2/K1) = Ea/2.303*R [ 1/T1 - 1/T2]
log(K2/1.09*10^-3) = 254000/2.303*8.314 [ 1/756 - 1/786]
log(K2/1.09*10^-3) = 13265.6[ 1/756 - 1/786]
log(K2/1.09*10^-3) = 13265.6(0.00132-0.00127)
log(K2/1.09*10^-3) = 0.66328
K2/1.09*10^-3 = 10^0.66328
K2/1.09*10^-3 = 4.6055
K2 = 1.09*10^-3*4.6055 = 0.005
K2 = 5*10^-3/S >>>>>answer
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1. The activation energy for the gas phase
decomposition of chloroethane is
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CH3CH2Cl--->C2H4
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