1.) A flask is charged with 0.100 mol of A and allowed to react to form B accord

Question

1.) A flask is charged with 0.100 mol of A and allowed to react to form B according to the hypothetical gas-phase reaction A(g) ---------> B(g). The following data are collected: Time in seconds ---- Moles of A 0 ---------------------- 0.100 40 ---------------------- 0.067 80 ---------------------- 0.045 120 --------------------- 0.030 160 --------------------- 0.020 a.) Calculate the number of moles of B at each time in the table. b.) Calculate the average rate of disappearance of A for each 40-s interval, in units of mol/s. c.)what additional information would be needed to calculate the rate in units of concentration per time?

Explanation / Answer

a/ Calculate the number of moles of B at each time in the table. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Time . . . . . . . n(A) . . . . . . . n(B) . . 0 . . . . . . . . 0,100 . . . . . . 0,000 . 40 . . . . . . . . 0,067 . . . . . . 0,033 . 80 . . . . . . . . 0,045 . . . . . . 0,055 120 . . . . . . . . 0,030 . . . . . . 0,070 160 . . . . . . . . 0,020 . . . . . . 0,080 b.) Calculate the average rate of disappearance of A for each 40-s interval, in units of mol/s - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ?n(A) / ?t (at t2) = ( n(A)3 - n(A)1 ) / (t3 - t1) Time . . . . . . . n(A) . . . . . . . n(B) . . . . . . . . . . . .?n(A) / ?t . . 0 . . . . . . . . 0,100 . . . . . . 0,000 . . . . . . . . . . . . . ./ . . . . . . 40 . . . . . . . . 0,067 . . . . . . 0,033 . . . . . - 6,875

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