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 s = _________ mol/s

Explanation / Answer

a) 0 s = 0 mol

   40 s = 0.130-0.062=0.068mol

80 s = 0.130-0.048=0.082mol

120 s = 0.130-0.027=0.103mol

160 s = 0.130-0.021=0.109

b) average rate= change in concentration of reactants / time taken

0-40s:   r=0.130-0.062/40-0 = 0.0017 mol/s  

40-80: r = 0.062-0.048/40=0.00035 mol/s

80-120: r= 0.048-0.027/40=0.000525 mol/s

120-160: r = 0.027-0.021/40=0.00015 mol/s

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