A flask is charged with 0.100 mol of A and allowed to react to form B according to the following hypothetical gas-phase reaction.

A(g) B(g)

The following data are collected.

times (s)	0	40	80	120	160
moles of A	0.100	0.070	0.041	0.033	0.018

(a) Calculate the number of moles of B at each time in the table. 0 s mol 40 s mol 80 s mol 120 s mol 160 s mol (b) Calculate the average rate of disappearance of A for each 40 s interval, in units of mol/s. 0 - 40 s mol/s 40 - 80 s mol/s 80 - 120 s mol/s 120 - 160 mol/s mol/s