A flask is charged with 0.150 mol of A and allowed to react to form B according

Question

A flask is charged with 0.150 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 ___mol

40 s

At 40 S moles of A = 0.072

0.150- 0.072 = 0.078 mole converted into B
________mol

80 s

0.150- 0.042 = 0.109 mole converted into B

__________ mol

120 s

0.150- 0.031= 0.119 mole converted into B
_________mol

160 s

0.150- 0.017= 0.133 mole converted into B

_________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

0.072 mol/L - 0.150 mol/L = -0.078 mol/L

-0.078 mol/L / 40s = -0.00195 mol/L/s
40 - 80 s
__________mol/s

0.042 mol/L - 0.072 mol/L = -0.03 mol/L

-0.03 mol/L / 40s = -0.00075 mol/L/s


80 - 120 s

0.031 mol/L - 0.042 mol/L = -0.011 mol/L

-0.011 mol/L / 40s = -0.000275 mol/L/s


____________ mol/s

120 - 160 mol/s

0.017 - 0.031 mol/L = -0.014 mol/L

-0.014 mol/L / 40s = -0.00035 mol/L/s


____________mol/s

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