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Harris - Quantitative Chemical Analysis 7/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2011

Instructor: Dr. Friendly

Current Score : 0 / 9

Due : Sunday, September 25, 2011 08:00 EDT

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  • 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.

Assignment Submission

For this assignment, the number of submissions for each answer box is counted independently. The number of submissions remaining changes only if you submit a new or changed answer.

1. –/2 points Notes Question: HarrisChem7 1.P.16.
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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 -69°C?
Enter a number.
 nM

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2. –/2 points Notes Question: HarrisChem7 1.P.32.
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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 4.600 L to give 5.00 M H2SO4?
Enter a number.
 mL
(b) Calculate the density of 98.0 wt% H2SO4.
Enter a number.
 g/mL

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3. –/2 points Notes Question: HarrisChem7 2.P.19.
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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?

    

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


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5. –/2 points Notes Question: HarrisChem7 4.P.04.
Question part
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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.

Your work in question(s) will also be submitted or saved.
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