WebAssign

Tuesday, February 9, 2010 11:33 AM EST

Logged in as whfreeman@whfreeman

Logout

Harris - Quantitative Chemical Analysis 7/e (Homework)

Chris Read

W.H. Freeman, section 1, Fall 2010

Instructor: Mr. Freeman

Current Score : 0 / 9

Due : Friday, September 3, 2010 07:00 PM EDT

About this Assignment

Question
Points
1 2 3 4 5
0/2 0/2 0/2 0/1 0/2
Total
0/9

Description

Here are some textbook questions from Quantitative Chemical Analysis 7/e by Daniel C. Harris published by W. H. Freeman. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/2 points Notes Question: HarrisChem7 1.P.16.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
The concentration of a gas is related to its pressure by the ideal gas law where n is the number of moles, V is volume (L), P is pressure (bar), and T is temperature (K).
Concentration (mol/L) = n/V = P/RT
R = gas constant = 0.08314 Lbar/molK
(a) The maximum pressure of ozone in the Antarctic stratosphere in the above figure is 19 mPa, convert this pressure into bars.
Enter a number.
 bars
(b) Find the molar concentration of ozone in part (a) if the temperature is -50.°C?
Enter a number.
 nM


2. –/2 points Notes Question: HarrisChem7 1.P.32.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A bottle of concentrated aqueous sulfuric acid, labeled 98.0 wt% H2SO4, has a concentration of 18.0 M.
(a) How many milliliters of reagent should be diluted to 2.600 L to give 3.00 M H2SO4?
Enter a number.
 mL
(b) Calculate the density of 98.0 wt% H2SO4.
Enter a number.
 g/mL


3. –/2 points Notes Question: HarrisChem7 2.P.19.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
What is the purpose of the trap in the figure below? (Select all that apply.)



What is the purpose of the watchglass in the figure below?

    



4. –/1 points Notes Question: HarrisChem7 3.P.13.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Cheryl, Cynthia, Carmen and Chastity shot the targets below at Girl Scout camp. State which shooters target with the proper description.
Carmen
Cynthia
Chastity
Cheryl



5. –/2 points Notes Question: HarrisChem7 4.P.04.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
Use Table 4-1 to solve to following problems.
(a) Calculate the fraction of bulbs in the above figure expected to have a lifetime greater than 1005.3 h.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.

(b) Find the fraction of bulbs expected to have a lifetime between 798.1 and 901.7 h.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.

Home My Assignments