(solution) A flask is charged with0.130mol of A and allowed to react to form

(solution) A flask is charged with0.130mol of A and allowed to react to form

A flask is charged with0.130mol 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 0.130 0.070 0.044 0.030 0.025

(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