A flask is charged with 0.130 mol of A and allowed to react to form B according

Question

A flask is charged with 0.130 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

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

0 s = 0.0 mol

mol

40 s     = 0.130 - 0.068 = 0.072 mol

mol

80 s = 0.130 - 0.041 = 0.089 mol

mol

120 s =   = 0.130 - 0.026 = 0.104 mol

mol

160 s =   = 0.130 - 0.015 = 0.115 mol

mol

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

0 - 40 s = 0.072 mol / 40 s = 0.0018 mol/s

mol/s

40 - 80 s = 0.027 mol/ 40 s = 0.000675 mol/s

mol/s

80 - 120 s = 0.016 mol/ 40s = 0.0004 mol/s

mol/s

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

mol/s

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