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ludmilkaskok [199]
3 years ago
5

Ethyl chloride vapor decomposes by the first-order reaction:

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
8 0

Explanation:

(a)  The given data is as follows.

            Frequency factor A = 1.60 \times 10^{14} s^{-1}

           Activation energy (E_{a}) = 249 kJ/mol

           Gas constant = 8.314 J/mol K

            Temperature (T) = 876 K

Hence, calculate the specific rate constant as follows.

                  K = Ae^{\frac{-E_{a}}{RT}}

                      = 1.60 \times 10^{14} s^{-1} e^{\frac{249000 J/mol}{8.314 J/mol K \times 876 K}}

                      = 1.60 \times 10^{14} s^{-1} \times 1.034

                      = 1.128 \times 10^{29}

Hence, the value of specific rate constant K is 1.6544 \times 10^{14}.

(b)  It is given that time is 20 minutes. As there are 60 seconds present in 1 min. Therefore, seconds present in 20 minutes are as follows.

            20 min \times \frac{60 sec}{1 min}

            = 1200 sec

Hence, for the first order reaction the fraction remaining is as follows.

                \frac{C}{C_{o}} = e^{-kt}

                              = e^{-1.6544 \times 10^{14} \times 1200 sec}

                              = 0

Hence, fraction decomposed = 1 - 0 = 1

Therefore, the fraction of the ethyl chloride that decomposes in 20 minutes at this temperature is 1.

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