Problem 14.14 Aflask is charged with 0.100 mol of A and allowed to react to form

Question

Problem 14.14 Aflask 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 (s) 0 40 80 120 160 Moles of A 0.100 0.067 0.045 0.030 0.020 Calculate the average rate of disappearance of A between t 80 s and t 120 S, in units of mol/s. Express your answer using two significant figures rate mol/s Submit My Answers Give Up Part H Calculate the average rate of disappearance of A between t 120 s and t 160 s in units of mol/s. Express your answer using two significant figures rate mol/s Submit My Answers Give Up Part I What additional information would be needed to calculate the rate in units of concentration per time? Essay answers are limited to about 500 words (3800 characters maximum, including spaces). 3800 Character(s) remaining Submit My Answers Give Up

Explanation / Answer

Solution : -

Part g calculating rate of disappearance in between time 80 s and 120 s

Formula

Rate = -[A]/ t

-[A] = change in concentration

t = change in time

Now lets put the values in the formula

Rate = -[0.030-0.045]/[120s -80 s]

Rate = 0.000375 mol/s

Or we can round it to 0.00038 mol /s also we can write it as 3.8*10-4 mol /s

Part H calculating rate of disappearance of A between time 120s and 160 s

Rate = -[A]/ t

-[A] = change in concentration

t = change in time

Now lets put the values in the formula

Rate = -[0.020-0.030]/[160 s -120 s]

Rate = 0.00025 mol /s

So rate between the time 120 s to 160 s = 0.00025 mol /s

Part i

To calculate the rate in the units of concentration per time we need change in the concentration of the reactant A per unit time. So that we can calculate the rate in the unit of concentration per time.

To calculate the concentration volume of the flask should be known.

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