Determine the average rate of change of B from t=0s to t=352s.

A to 2B

Time Concentration of A (M)
0 0.670
176 0.385
352 0.100

1 answer

Just like any other average.
(A) changed from 0.670 to 0.100 or 0.570 M. That change took 352 sec; therefore, 0.570/352 = ??
http://www.chem.purdue.edu/gchelp/howtosolveit/Kinetics/CalculatingRates.html#AvgRate