A flask is charged with 0.100 mol of A and allowed to react to form B according

Question

A flask is charged with 0.100 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

Answer: According to question :

a] number of moles of B :

At 0S = zero number of mole of B

At 40 s

moles of B = 0.100- 0.066 = 0.034 mol of B

At 80s ,

moles of B = 0.100 - 0.043 = 0.057 mol

At 120 S ,

moles of B = 0.100 - 0.026 = 0.074 mol

at 160s , mol of B = 0.1 - 0.024 = 0.076 mol

B] from 0-40

- d[A]/dt = 0.034 / 40 = 0.00085

frm 40 to 80

= -dA/dT = 0.000575

from 80to 120

-dA/dT = -[0.026-0.043 /40 = 0.000425

from 120 to 160

-dA/dT = -[0.024-0.026 / 40 = 5 * 10-5

Hence this is all about the required answer of the question

Thank you

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