This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Chemistry 2080 Spring 2009
Problem Set #4 - due date: Friday, February 20th at 2 pm
Name: Lab TA Name: Lab Dayfl'ime: Practice problems (not graded). Chapter 14: 11, 12, 19, 23, 25, 33, 55 also Example 14—5 and the associated
Practice Example A, and Example 14—8 and the associated Practice Examples A and B. 1) Here are some rates that were obtained at 298.15K for the reaction: A + B > C Initial Rate of Disapmarance ofA(M/51 |A|§M1 |B|(M)
0.053 0.10 0.50
0.127 0.20 0.30
1.02 0.40 0.60
0.254 0.20 0.60
0.509 0.40 0.30 The concentrations of A and B given above are the starting concentrations. (a) Determine the overall order of the reaction. (b) Determine the initial rate of disappearance of A when the concentration of A is 0.30 M and
that of B is 0.40 M. 2) The following gas—phase reaction was studied at 290°C by observing the change in pressure as a function of
time in a constant volume vessel: ClCOZCCl3(g) > 2COC]2(g)
Determine the order of the reaction, and the rate constant, based on the following data (P is the total pressure):
Time s P (mmHg)
1164 27 .08 You may ﬁnd the following graphing area useful. 0 200 400 600 300 000 1200
time (seconds) 3) There is an old chemistry “rule” (it’s more of a guideline, really) that if you raise the temperature of a reaction
from 25°C to 50°C you will raise the rate by a factor of 10. a) What is the activation energy for a reaction that adheres to this rule? b) Given the activation energy that you calculated in (a), what would be the rate ratio on raising the temperature
from 100°C to 125°C? ...
View Full Document
This note was uploaded on 02/25/2009 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).
- Spring '07