Question

2. Consider the following generic reaction: 2 A+3 B C+D a. Define the reaction rate in terms of the relative rates of disappearance/appearance of each species in the equation. b. I rate of appearance of C is 1.20 0M s'at a particular instant, what rate is B disappearing at that instant? If A is disappearing at a rate of 2.90 x 10 Mst at a particular instant, at what rate is B disappearing at that instant? c.

Answer 1

Rate of reaction = change in concentration/time taken for the change For the reaction 2A + 3B rightarrow C + 1/2 D (a) Reaction rate in terms of the relative rates of disappearance/Appearance of each species in the reaction is as follows- -1/2 d[A]/dt = -1/3 d[B]/dt = d[C]/dt = 1/1/2 d[D]/dt in the above expression negative (-ve) sign represents the disappearance of reactants and positive (+) sign represents the appearance of products. (b) given, rate of appearance of C i.e d[C]/dt = 1.20 times 10^-4 Ms^-1 d[B]/dt = ? r\n using the equation of part (a) -1/3 d[B]/dt = d[C]/dt d[B]/dt = 3d[C]/dt d[B]/dt = 3 times 1.20 times 10^-4 Ms^-1 d[B]/dt = 3.60 times 10^-4 Ms^-1 Note: - negative sing doesn't involve in calculation. (c) given, rate of disappearance of A. -d[A]/dt = 2.90 times 10^-6 Ms^-1 so, -d[B]/dt = ? -1/2 d[A]/dt = -1/3 d[B]/dt 3/2 d[A]/dt = d[B]/dt 3/2 times 2.90 times 10^-6 = d[B]/dt