A flask is charged with 0.140 mol of A and allowed to react to form B according

Question

A flask is charged with 0.140 mol of A and allowed to react to form B according to the following hypothetical gas-phase reaction.

The following data are collected.

(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

Explanation / Answer

For the given reaction,

(a) Calculate the number of moles of B at each time in the table

0 s
0.140-0.140 = 0 mol

40 s
0.140-0.067 = 0.073 mol

80 s
0.140-0.047 = 0.093 mol

120 s
0.140-0.029 = 0.111 mol

160 s
0.140-0.019 = 0.121 mol

(b) Calculate the average rate of disappearance of A for each 40 s interval, in units of mol/s.

0 - 40 s
(0.067-0.140)/40 = -0.0018 mol/s

40 - 80 s
(0.047-0.067)/40 = -0.0005 mol/s

80 - 120 s
(0.029-0.047)/40 = -0.00045 mol/s

120 - 160 mol/s
(0.019-0.029)/40 = -0.00025 mol/s

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.