Question

1. Table below contains the information on decomposition of ammonia. Using that table calculate the initial and average rate of reaction.

                             

Time, min	NH3, M
0	6
1	3
2	1.5
3	0.75
4	0.375
5	0.1875

Show your work.

Answer 1

Solution:

From the table,

Part A) When, t = 0 min, then [NH3] = 6 M

At ,t = 1 min, [NH3] = 3 M

Thus,

Initial rate = - dX/dt = - (3 M - 6 M) / 1 - 0 min

Initial rate = 3.0 M /min

Part B)

Average rate = - dX/dt

dX = final concentration - initial concentration

dX = 0.1875 M - 6.0 M = -5.8125 M

dt = 5 -0 = 5 min

Therefore,

Average rate = - (- 5.8125) M / 5 min

= 1.1625 M/min