Question

Consider the following hypothetical aqueous reaction: A(aq)→B(aq). A flask is charged with 0.065 mol of A in a total volume of 100.0 mL. The following data are collected:

Time (min)	0	10	20	30	40
Moles of A	0.065	0.051	0.042	0.036	0.031

Part A

Calculate the average rate of disappearance of A between t= 30 min and t= 40 min, in units of M/s.

Express your answer using two significant figures.

Part B

Between t= 10 min and t= 30 min, what is the average rate of appearance of B in units of M/s? Assume that the volume of the solution is constant.

Express your answer using two significant figures.