Question

The concentration of reactant A (in M) in a reaction of A → products was monitored as a function of time. The experimental data were plotted in three graphs of [A] versus time, ln[A] versus time, and 1/[A] versus time as shown. Determine the reaction order. Reaction order graph Not enough information to determine the reaction order.

0.8 0.6 0.4 0.2 3 -2 0 2 46 8 10 12 14 0 2 4 6 8 10 12 140 2 4 6 8 10 12 14 Time (s) Time (s) Time (s)

Zero order

First order

Second order

Not enough information to determine the reaction order.

Answer 1

The integrated law for different order reactions are given as follows: For Zero order: (-4,1-[4]=kt For First order: In =ht In [4]-In [4]=ht For Second order: The equations follow line equation (y = mx + c) and gives a linear graph. For zero order, the linear graph is plotted between [4] and t, where the slope is -k and intercept is [4] For first order, the linear graph is plotted between In 4 and t, where the slope is -k and intercept is In[4] For second order reaction, the linear graph is plotted between and t with slope k and intercept 141 Therefore, The first graph is of zero order. The second graph is of first order. The third graph is of second order.