A flask is charged with 0.120 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 0.120 0.063 0.046 0.026 0.015   (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

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