A flask is charged with 0.120 mol of A and allowed to react to form B according

Question

A flask is charged with 0.120 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) the moles of B are given below

time(s)        moles of A           moles of B

0                   0.120                    0

40                 0.067                 0.053

80                 0.041                 0.079

120               0.035                 0.085

160               0.025                 0.095

(b) Average rate of dissapearence of A for each interval would be,

-dA/dt as shown below

Interval (s)    Average rate of dissapearence of A (mol/s)

   0-40              -(0.067-0.120)/40 = -0.001325

40-80                     -0.026/40 = -0.00065

80-120                   -0.006/40 = 0.00015

120-160                 -0.01/40 = 0.00025

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

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