6 replies to this topic

[chemtoli]

For this type of reaction (second order reaction in a constant pressure-variable volume batch reactor)

 

A+B -->C

 

at T=23°C, we have k= 0.1615 L /mol*min  and C_A0=C_B0= 0.016 mol/L

 

Calculate the half-time of the reaction (t_1/2) and the rate of conversion of reactant, A (X_A) after 100 minutes.

 

 

 

What is the equation for half-time of the reaction (t_1/2)

[breizh]

Hi,

The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value.

​Share with us your work, someone will comment.

Good luck

Breizh

[chemtoli]

hi breizh,

 

based on the data from the Book of GAVHANE, I have reached this point (see the attachment). But now I don't know how to calculate the half life of the reaction and the rate of conversion of reactant A, after 100 minutes.

 

 

 

 

Attached Files

•  Second oreder constant p-varying V.pdf   123.67KB   9 downloads

[breizh]

hi, come on!
-ra=k CA^2=-dCA/dt
perform the integration between the limits, t & to=0 with the respective concentration CA and CA0.

Breizh

[chemtoli]

Breizh

 

can this equation be applied to the case when reaction is second order in a constant pressure-variable volume batch reactor. 

 

 

t_1/2=(1/k)*[(1/C_A)-(1/C_A0)]

 

what is value of C_A and how to find X_A

Edited by chemtoli, 22 August 2023 - 12:04 PM.

[breizh]

Hi,

You seem not having a proper method to solve problems.

You should assess first the data available, secondly establish the general equation and finally apply it to particular cases (questions 1 and 2). 

Get the general equation: t = function (Ca, Cao, k) and then play around for your particular cases. 

1) t1/2 should be 387 '

2) XA=0.205

 

Breizh 

[chemtoli]

thank you so much breizh