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Zumdahl and Zumdahl - Chemistry 8/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 15 / 18

Due : Thursday, April 16, 2020 07:00 EDT

Last Saved : n/a Saving...  ()

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–/3 –/6 –/2 –/3 –/2 –/2
Total
15/18 (83.3%)

  • Instructions

    Chemistry 8th Edition by Zumdahl/Zumdahl includes more than 980 end-of-chapter problems plus ChemWork assignments and Thinkwell® lecture videos. Questions provide links to Practice It exercises, Watch It videos, relevant textbook pages, and online, live help.

    Questions 1-6 are end-of-chapter problems enhanced with links to Watch It, Practice It, and Chat About It buttons.

    Watch It - Watch Its include 5 to 7 minute mini-lectures from Thinkwell®.

    Practice It - Practice Its include Visual Exercises that combine molecular-level animations and videos demonstrations that cover core chemistry concepts. Each animation or video is accompanied by questions to aid students in conceptualization of the topic.

    Chat About It - Online, live help This demo assignment allows many submissions and allows you to try another version of the same question for practice.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

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1. –/3 points ZumChem8 3.E.047. My Notes
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–/3
 
Calculate the molar mass of the following substances.
(a)
(No Response) g/mol

(b)
(No Response) g/mol

(c) (NH4)2Cr2O7
(No Response) g/mol

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2. –/6 points ZumChem8 3.E.065. My Notes
Question Part
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1 2 3 4 5 6
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–/6
 
Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make "Mickey Finns" in detective stories.
(a) Calculate the molar mass of chloral hydrate.
(No Response) g/mol

(b) What amount (moles) of C2H3Cl3O2 molecules are in 503.6 g chloral hydrate?
WebAssign will check your answer for the correct number of significant figures.(No Response) mol

(c) What is the mass in grams of 1.4 ✕ 10-2 mol chloral hydrate?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

(d) What number of chlorine atoms are in 2.7 g chloral hydrate?
WebAssign will check your answer for the correct number of significant figures.(No Response)

(e) What mass of chloral hydrate would contain 3.7 g Cl?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

(f) What is the mass of exactly 525 molecules of chloral hydrate?
(No Response) g

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3. –/2 points ZumChem8 3.E.142. My Notes
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1 2
–/1 –/1
0/50 0/50
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–/2
 
Methane (CH4) is the main component of marsh gas. Heating methane in the presence of sulfur produces carbon disulfide and hydrogen sulfide as the only products.
(a) Write the balanced chemical equation for the reaction of methane and sulfur. (Use the lowest possible coefficients. Include states of matter under SATP conditions in your answer.)

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(b) Calculate the theoretical yield of carbon disulfide when 180. g of methane is reacted with an equal mass of sulfur.
WebAssign will check your answer for the correct number of significant figures.(No Response) g

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4. –/3 points ZumChem8 3.E.062. My Notes
Question Part
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1 2 3
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–/3
 
What amount (moles) is represented by each of these samples?
(a) 18.7 mg caffeine, C8H10N4O2
WebAssign will check your answer for the correct number of significant figures.(No Response) moles

(b) 2.71 1021 molecules of ethanol, C2H5OH
WebAssign will check your answer for the correct number of significant figures.(No Response) moles

(c) 1.54 g of dry ice, CO2
WebAssign will check your answer for the correct number of significant figures.(No Response) moles

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5. –/2 points ZumChem8 3.E.044. My Notes
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1 2
–/1 –/1
0/50 0/50
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–/2
 
A diamond contains 9.4 1021 atoms of carbon. What amount (moles) of carbon are in this diamond?
WebAssign will check your answer for the correct number of significant figures.(No Response) mol

What mass (grams) of carbon are in this diamond?
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6. –/2 points ZumChem8 3.E.170. My Notes
Question Part
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–/2
 
The compound As2I4 is synthesized by reaction of arsenic metal with arsenic triiodide. If a solid cubic block of arsenic (d = 5.72 g/cm3) that is 3 cm on edge is allowed to react with 1.01 ✕ 1024 molecules of arsenic triiodide, how much As2I4 can be prepared?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

If the percent yield of As2I4 was 75.6%, what mass of As2I4 was actually isolated?
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