A flask is charged with 0.124 md of A and allowed to react to form B according t

Question

A flask is charged with 0.124 md of A and allowed to react to form B according to the reaction A(g) B(g). The following data are obtained for [A] as the reaction proceeds:

The average rate of appearance of B between 20 s and 30 s is ________ mol/s.

A flask is charged with 0.124 md of A and allowed to react to form B according to the reaction A(g) B(g). The following data are obtained for [A] as the reaction proceeds:

The average rate of appearance of B between 20 s and 30 s is ________ mol/s.

Explanation / Answer

the reaction is given by

A ---> B

so

the relation between average rates of A and B are given by

-dA / dt = dB / dt

so

between 20s ans 30 s

the average reate of dissapearance of A is given by

dA / dt = ( -0.073 - 0.088) / ( 30-20)

dA/dt = -1.5 x 10-3

now

dB / dt = - (dA/dt)

so

using the obtained value

dB / dt = - ( -1.5 x 10-3)

dB / dt = 1.5 x 10-3

so

the average rate of appearance of B between 20 s and 30 s is 1.5 x 10-3 mol/s

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