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.

A(g)---> B(g)

The following data are collected.

times (s) 0 40 80 120 160
moles of A 0.130 0.072 0.041 0.030 0.017


(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

times (s) 0 40 80 120 160 moles of A 0.130 0.072 0.041 0.030 0.017 a). 0s => 0 moles B 40 s => 0.058 moles B 80 s => 0.089 moles B 120 s => 0.1 moles B 160s => 0.113 moles B b). 0.058moles/40 seconds = 0.00145 moles/s for first 40 (0.089-0.058)/40 seconds = 0.000775 moles/s for 40-80 (0.1-0.089)/40 seconds = 0.000275 moles/s for 80-120 (0.113-0.1)/40 seconds = 0.000325 moles/s for the 120-160

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