Scribd
Upload
526 views1 page

Chemical Reactions Engineering

This document contains a 10 question multiple choice exam on chemical kinetics and reaction engineering. The questions cover homogeneous and heterogeneous reaction kinetics, including zero, first, and second order reactions. Rate laws, concentration changes over time, half lives, and the calculation of rate constants are assessed. Initial concentrations and reaction conditions like temperature and pressure are provided to calculate time required to consume a given percentage of a reactant.

Uploaded by

WinsletJoyDauag
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
526 views1 page

Chemical Reactions Engineering

This document contains a 10 question multiple choice exam on chemical kinetics and reaction engineering. The questions cover homogeneous and heterogeneous reaction kinetics, including zero, first, and second order reactions. Rate laws, concentration changes over time, half lives, and the calculation of rate constants are assessed. Initial concentrations and reaction conditions like temperature and pressure are provided to calculate time required to consume a given percentage of a reactant.

Uploaded by

WinsletJoyDauag
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
You are on page 1/ 1

TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES

ENVIRONMENTAL ENGINEERING (ENVI 003)


PRELIM EXAMINATION SET A
STUDENT NO._____________________________ SECTION : CH51FC1
INSTRUCTOR : ENGR. LORRAINE A. CARRILLO DATE: JULY 19, 2007

MULTIPLE CHOICE. ENCIRCLE THE CORRECT ANSWER. POINTS ALLOCATION, 1 POINT FOR
CORRECT CHOICE, 5 POINTS FOR CORRECT SOLUTION

The homogeneous first – order gas phase reaction A 3B has a rate constant k = 0.5 min.
Pure A at 1 atm was introduced into a constant – volume batch reactor.
1. The relationship of the total pressure of the system to the partial pressure of A is
a. Pt = 3Pao – 2Pa b. Pa = 3Pao – 2Pt c. Pt = 2Pao – 3Pa d. Pa = 3Pt – 2Pa
2. The total pressure after 4 minutes
a. 2.86 atm b. 2.73 atm c. 2.55 atm d. 2.26 atm
3. The total pressure after 2 minutes
a. 2.86 atm b. 2.73 atm c. 2.55 atm d. 2.26 atm

The aqueous – phase reaction A R + S proceeds as follows,


Time, min 0 36 65 100 160 ∞
Ca, mole/liter 0.1823 0.1453 0.1216 0.1025 0.0795
0.0494
With Ca0 = 0.1823 mole / Liter, Cr0 = 0 and Cso = 55 mole /liter
4. The rate constant k for the reaction is
a. k = 0.0116 b. k = 0.0126 c. k = 0.0146 d. k = 0.0156

The reaction A + B + C products has equimolar amounts initially, 1 M. If the reaction is


second – order with respect to A and first – order with respect to B and C.
5. The rate constant k is equal to ______ if 30% Cao decomposes after 0.5 hours.
a. 0.59 / hour b. 1.277 / hour c. 7.211 / hour c. 2.177 / hour
6. The concentration of A after 1 hour
a. 0.59 b. 1.277 c. 7.211 c. 2.177
7. The half-life of the reaction
a. 2.781 hours b. 1.2781 hours c. 1.782 hours c. 1.827 hours

A 200 - liter constant-volume batch reactor is pressurized to 20 atm with a mixture of 75% A
and 25% inert. The gas-phase reaction is carried out isothermally at 227 C.
8. Assuming that the ideal gas law is valid, What is the initial concentration of A?
a. 0.488m/L b. 0.366 moles/L c. 0.477moles/L d. 0.45 moles/L
If the reaction is first order:  ra  kCa with k = 0.1 per min
9. Calculate the time necessary to consume 99% of A.
a. 46.1 min b. 4.61 min c. 15.1 min d. 1.51 min
2
10. If the reaction is second order:  ra  kCa with k = 0.7 L/mol-min, the time necessary to consume 99% of A
a. 146.1 min b. 14.61 min c. 141.4 min d. 1.51 min

You might also like