17. If the activation energy for a given compound is 103 kJ mol and the frequenc

Question

17. If the activation energy for a given compound is 103 kJ mol and the frequency factor is 4.0 x 1013 s-1, what is the constant ratio for this reaction at 398 K? a) 1.2 s-1 b) 8.2 s-1 c) 3.9 x 1010 s-1 d) 1.7 x 1010 s-1 e) 2.5 x 107 s-1 18. The disappearance ratio of HBr in the gas phase reaction is 0.301 M s-1 at 150C. The reason for the appearance of Br2 is a) 1.66 b) 0.151 c) 0.0906 d) 0.602 e) 0.549 19. The decomposition reaction of So2c12 is as follows: SO2C12 (g)-SO2 (g) + C12 (g) The reaction is first order for SO2C12 and a constant ratio of 3.0 x 10-6 s-1 to 600K. The container is loaded with a pressure of 2.4 atm of SO2C12 at 600K. The partial pressure of SO2C12 at 3.0 x 105 s is a) 0.76 b) 2.2 c) 0.98 d) 0.29 e) 1.4 x 105 20. What is the unit of k for a second-order reaction? a) M/s b) M c) M-ls-1 d) M2 s e)/M M s-1. The reaction is as follows: 2HBr (g) ? H2 (g) + Br2 (g) atm

Explanation / Answer

17)Solution

k = A exp(-Ea/RT)
k = 4 x10^ 13 exp( -103000/8.314 x398) A is frequency factor , Here Ea = activation energy
= 4 x 10^ 13 x 3 x10^ -14
= 1.2 s^ -1

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