1. Given that the bond strength of the C-3H bond is 6.3 kJ/mol greater than that

Question

1. Given that the bond strength of the C-3H bond is 6.3 kJ/mol greater than that of C-1H bond, calculate the change in the rate that would be expected on replacing 1H by 3H in a C-H bond that is fully broken in the rate determining step of a reaction at 300 K. 1. Given that the bond strength of the C-3H bond is 6.3 kJ/mol greater than that of C-1H bond, calculate the change in the rate that would be expected on replacing 1H by 3H in a C-H bond that is fully broken in the rate determining step of a reaction at 300 K.

Explanation / Answer

1. Given the bond strength of C-3H bond be 6.3 kJ/mol greater than that of C-1H bond,

using,

dG = -RTlnK

with,

K = rate change

T = 300 K

R = gas constant

dG = 6.3 kJ/mol = 6.3 x 10^3 J/mol

we get,

6.3 x 10^3 = -8.314 x 300 lnK

K = 0.08

So the rate if reaction would decrease by 0.08 times when 1H is replaced by 3H in a C-H bond that is fully broken in the rate determining step of a reaction at 300 K

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