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

ID: 1023702 • Letter: A

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.

times (s) 0 40 80 120 160

moles of A 0.140 0.069 0.045 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

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

0 s = 0.0 mol

40 s = 0.140 - 0.069 = 0.071 mol

80 s = 0.140 - 0.045 = 0.095 mol

120 s = = 0.140 - 0.033 = 0.107 mol

160 s = = 0.140 - 0.018 = 0.122 mol

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

0 - 40 s = 0.071 mol / 40 s = 0.001775 mol/s

40 - 80 s = 0.024 mol/ 40 s = 0.0006 mol/s

80 - 120 s = 0.012 mol/ 40s = 0.0003 mol/s

120 - 160 mol/s = 0.015 mol/ 40s = 0.00375 mol/s

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