424 311 Chemical Reaction Engineering I

Homework Solution

Part I before Midterm Examination

since June 19th

– July 12th

, 2012

Other Problem

A zero-order homogeneous gas reaction with stoichiometry A→R

proceeds in a constant-volume bomb, Pt = 1 atm when t = 0 and Pt =

1.5 atm when t = 1hr. If the same reaction, same feed composition,

and initial pressure proceeds in a constant-pressure setup, find V at t =

1 hr if V0 = 1 at t = 0.

The first-order homogeneous gaseous decomposition A→2.5R is

carried out in an isothermal batch reactor at 2 atm with 20% inerts

present, and the volume increase by 60% in 20 minute. In a constant-

volume reactor, find the time required for the pressure to reach 8 atm

if the initial pressure is 5 atm, 2 atm of which consist of inerts.

The gas reaction 2A→R+2S is approximately second order with

respect to A. When pure A is introduced at 1 atm into a constant-

volume batch reactor, the pressure rises 40% in 3 minute. For a

constant-pressure batch reactor find (a) the time required for the same

conversion, and (b) the fractional increase in volume at that time.

A zero-order homogeneous gas reaction A→rR proceeds in a

constant-volume bomb, 20% inerts, and the pressure rises from 1 to

1.3 atm in 2 minute. If the same reaction take place in a pressure-

constant batch reactor, what is the fractional volume change in 4

minute if feed is 3 atm and consists of 40% inerts.