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Zumdahl and DeCoste - Chemical Principles 7/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 4 / 30

Due : Thursday, April 2, 2020 06:00 EDT

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6
–/1 –/4 –/11 –/8 –/2 –/4
Total
4/30 (13.3%)

  • Instructions

    Chemical Principles 7th Edition by Steven S. Zumdahl and Donald J. DeCoste includes more than 1570 end-of-chapter problems plus ChemWork assignments and Thinkwell® lecture videos. Questions provide links to Practice It exercises, Watch It videos, and relevant textbook pages.

    Questions 1-6 are end-of-chapter problems enhanced with links to Read It and Watch It buttons.

    Read It - Relevant textbook pages

    Watch It - Watch Its include 5 to 7 minute mini-lectures from Thinkwell®. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

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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.

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Your last submission is used for your score.

1. –/1 points ZumChemP7 5.AE.113. My Notes
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–/1
 
A 2.747 g sample of manganese metal is reacted with excess HCl gas to produce 3.00 L of H2(g) at 386 K and 1.056 atm and a manganese chloride compound (MnClx). What is the formula of the manganese chloride compound produced in the reaction?

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2. –/4 points ZumChemP7 5.AE.114. My Notes
Question Part
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Submissions Used
1 2 3 4
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–/4
 
The total mass that can be lifted by a balloon is given by the difference between the mass of the air displaced by the balloon and the mass of the gas inside the balloon. Consider a hot-air balloon that approximates a sphere 5.30 m in diameter and contains air heated to 57°C. The surrounding air temperature is 17°C. The pressure in the balloon is equal to the atmospheric pressure, which is 745 torr.
(a) What total mass can the balloon lift? Assume the average molar mass of air is 29.0. (Hint: Heated air is less dense than cool air.)
WebAssign will check your answer for the correct number of significant figures.(No Response) g

(b) If the balloon is filled with enough helium at 17°C and 745 torr to achieve the same volume as in part a, what total mass can the balloon lift?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

(c) What mass could the hot-air balloon (from part a) lift if it were on the ground in Denver, Colorado, where a typical atmospheric pressure is 630. torr?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

(d) What mass could the hot-air balloon (from part a) lift it were a cold day with temperature of -6°C?
WebAssign will check your answer for the correct number of significant figures.(No Response) g

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3. –/11 points ZumChemP7 5.CP.147. My Notes
Question Part
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Submissions Used
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–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
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–/11
 
Methane (CH4) gas flows into a combustion chamber at a rate of 200. L/min at 1.60 atm and ambient temperature. Air is added to the chamber at 1.00 atm and the same temperature, and the gases are ignited.
(a) To ensure complete combustion of CH4 to CO2(g) and H2O(g), three times as much oxygen as is necessary is reacted. Assuming air is 21 mole percent O2 and 79 mole percent N2, calculate the flow rate of air necessary to deliver the required amount of oxygen.
WebAssign will check your answer for the correct number of significant figures.(No Response) L air/min

(b) Under the conditions in part (a), combustion of methane was not complete as a mixture of CO2(g) and CO(g) was produced. It was determined that 95.0% of the carbon in the exhaust gas was present in the CO2. The remainder was present as carbon in the CO. Calculate the composition of the exhaust gas in terms of mole fractions of CO, CO2, O2, N2, and H2O. Assume CH4 is completely reacted and N2 is unreacted.
CO
WebAssign will check your answer for the correct number of significant figures.(No Response) 		CO2
WebAssign will check your answer for the correct number of significant figures.(No Response) 		O2
WebAssign will check your answer for the correct number of significant figures.(No Response)
H2O
WebAssign will check your answer for the correct number of significant figures.(No Response) 		N2
WebAssign will check your answer for the correct number of significant figures.(No Response)

(c) Assuming a total pressure of the exhaust gas of 1.00 atm, calculate the partial pressures of the gases in part b.
CO
WebAssign will check your answer for the correct number of significant figures.(No Response) atm		CO2
WebAssign will check your answer for the correct number of significant figures.(No Response) atm		O2
WebAssign will check your answer for the correct number of significant figures.(No Response) atm
H2O
WebAssign will check your answer for the correct number of significant figures.(No Response) atm		N2
WebAssign will check your answer for the correct number of significant figures.(No Response) atm

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4. –/8 points ZumChemP7 5.E.022. My Notes
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A diagram for an open-tube manometer is shown below.
If the flask is open to the atmosphere, the mercury levels are equal. For each of the following situations in which a gas is contained in the flask, calculate the pressure in the flask in torr, atmospheres, and pascals.
(a) ha = 124 mm
WebAssign will check your answer for the correct number of significant figures.(No Response) torr
WebAssign will check your answer for the correct number of significant figures.(No Response) atm
WebAssign will check your answer for the correct number of significant figures.(No Response) pascals

(b) hb = 210. mm
WebAssign will check your answer for the correct number of significant figures.(No Response) torr
WebAssign will check your answer for the correct number of significant figures.(No Response) atm
WebAssign will check your answer for the correct number of significant figures.(No Response) pascals

(c) Calculate the pressures in the flask in parts (a) and (b) (in torr) if the atmospheric pressure is 660. torr.
part (a)
WebAssign will check your answer for the correct number of significant figures.(No Response) torr
part (b)
WebAssign will check your answer for the correct number of significant figures.(No Response) torr

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5. –/2 points ZumChemP7 5.E.068. My Notes
Question Part
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–/2
 
An organic compound contains C, H, N, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.0991 g of H2O. A sample of 0.4831 g of of the compound was analyzed for nitrogen by the Dumas method. At STP, 27.6 mL of dry N2 was obtained. In a third experiment the density of the compound as a gas was found to be 4.02 g/L at 127°C and 256 torr. What are the empirical formula and the molecular formula of the compound?
empirical formula

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molecular formula

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6. –/4 points ZumChemP7 5.E.077. My Notes
Question Part
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–/4
 
Calculate the average kinetic energies of the CH4 and N2 molecules at 295 K and 531 K.
295 K531 K
CH4WebAssign will check your answer for the correct number of significant figures.(No Response) J/moleculeWebAssign will check your answer for the correct number of significant figures.(No Response) J/molecule
N2WebAssign will check your answer for the correct number of significant figures.(No Response) J/moleculeWebAssign will check your answer for the correct number of significant figures.(No Response) J/molecule

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