CHE 1302 Lecture Notes - Lecture 3: Stoichiometry
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For the reaction 3a b: after 1 minute of reaction [b] = 1. 2 m, and after 10 more minutes, [b] = 9. 0 m. calculate the average rate in the first minute and in the next 10 minutes. The concentration of b at time t is as follows: time, t (min): 9. 0 (since b is a product, we deduce that at the start of the reaction [b] is zero. ) And then in the next ten minutes: rate. Note, of course, that rate is decreasing as a is consumed! Suppose now that we wanted to find the rate of change of concentration of compound a during the first minute of reaction. Recall that in general we can write expressions for the rate of reaction in terms of reactants or products (and remember to take stoichiometry into account! rate. Then we can use this to relate rate of change of [a] to rate of change of [b] or to the rate of reaction:
