A solution of pentane and ethanol (CH CH,OH) is boiling at 77.1 °C. A sample of the vapor above the solution is cooled until it condenses. This condensedsample is analyzed, and turns out to be 10.% pentane by mass.Calculate the percent by mass of pentane in the boiling solution. Here's some data you may need:normalvapor pressuredensityboiling pointat 77.1 °C36. °Cpentane0.63mL2451. torr18Arethanol78. °C0.79mL725. torrBe sure your answer has 2 significant digits.Note for advanced students: you may assume the solution and vapor above it are ideal.%x10ExplanationCheck2019 McGraw-Hill Education. All Rights Reserved. Terms of Use PrivacyLenovooox XEscXHomeInsertEndDeleteFnLockF2F1F3F4F5F6F8F7F9F10F11F12!&Backspac14237RQTPTabF GJKASHDapsLock+1ICOCOLO Calculate the percent by mass of pentane in the boiling solution. Here's some datvapor pressurenormaldensityboiling pointat 77.1 °Cg0.63mL36. °Cpentane2451. torrethanol78. °C0.79mL725. torrBe sure your answer has 2 significant digits.Note for advanced students: you may assume the solution and vapor above it are idex10ExplanationCheck

Question
Asked Nov 7, 2019

Calculate the percent by mass of pentane in the boiling solution here some day you may need in the picture round your answer to two significant digits

A solution of pentane and ethanol (CH CH,OH) is boiling at 77.1 °C. A sample of the vapor above the solution is cooled until it condenses. This condensed
sample is analyzed, and turns out to be 10.% pentane by mass.
Calculate the percent by mass of pentane in the boiling solution. Here's some data you may need:
normal
vapor pressure
density
boiling point
at 77.1 °C
36. °C
pentane
0.63
mL
2451. torr
18
Ar
ethanol
78. °C
0.79
mL
725. torr
Be sure your answer has 2 significant digits.
Note for advanced students: you may assume the solution and vapor above it are ideal.
%
x10
Explanation
Check
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A solution of pentane and ethanol (CH CH,OH) is boiling at 77.1 °C. A sample of the vapor above the solution is cooled until it condenses. This condensed sample is analyzed, and turns out to be 10.% pentane by mass. Calculate the percent by mass of pentane in the boiling solution. Here's some data you may need: normal vapor pressure density boiling point at 77.1 °C 36. °C pentane 0.63 mL 2451. torr 18 Ar ethanol 78. °C 0.79 mL 725. torr Be sure your answer has 2 significant digits. Note for advanced students: you may assume the solution and vapor above it are ideal. % x10 Explanation Check 2019 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy Lenovo oox X Esc X Home Insert End Delete FnLock F2 F1 F3 F4 F5 F6 F8 F7 F9 F10 F11 F12 ! & Backspac 1 4 2 3 7 R Q T P Tab F G JK A S H D apsLock +1I CO CO LO

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Calculate the percent by mass of pentane in the boiling solution. Here's some dat
vapor pressure
normal
density
boiling point
at 77.1 °C
g
0.63
mL
36. °C
pentane
2451. torr
ethanol
78. °C
0.79
mL
725. torr
Be sure your answer has 2 significant digits.
Note for advanced students: you may assume the solution and vapor above it are ide
x10
Explanation
Check
help_outline

Image Transcriptionclose

Calculate the percent by mass of pentane in the boiling solution. Here's some dat vapor pressure normal density boiling point at 77.1 °C g 0.63 mL 36. °C pentane 2451. torr ethanol 78. °C 0.79 mL 725. torr Be sure your answer has 2 significant digits. Note for advanced students: you may assume the solution and vapor above it are ide x10 Explanation Check

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check_circleExpert Solution
Step 1

Given,

Vapour pressure of pentane = 2451. torr

Vapour pressure of ethanol = 725 torr.

Mass of pentane = 10 g

Mass of ethanol = 90 g

Molecular weight of pentane = 72.15 g/mol

Molecular weight of ethanol = 46.07 g/mol

Number of moles of pentane is calculated as follows,
Mass
Moles
Molar mass
10g
Moles
72.15 g/mol
Moles 0.1386
Number of moles of ethane is calculated as follows,
Mass
Moles
Molar mass
90g
46.07 g/mol
Moles
Moles 1.9535
Mole fraction of pentane is given below
Mole fraction A
nA n
nsolvent
ng solute
Mole fraction
+
0.1386
Mole fraction
(0.1386)+ (1.9535)
Mole fraction 0.0662
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Number of moles of pentane is calculated as follows, Mass Moles Molar mass 10g Moles 72.15 g/mol Moles 0.1386 Number of moles of ethane is calculated as follows, Mass Moles Molar mass 90g 46.07 g/mol Moles Moles 1.9535 Mole fraction of pentane is given below Mole fraction A nA n nsolvent ng solute Mole fraction + 0.1386 Mole fraction (0.1386)+ (1.9535) Mole fraction 0.0662

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Step 2

vapour pressure is ...

Mole fraction of ethanol is given below,
Mole fraction
nAn
+
1.9535
Mole fraction
(0.1386)+ (1.9535)
Mole fraction 0.93375
Vapour pressure is calculated as follows
Vapour pressure of solution mole fraction xvapour pressure.
Vapour pressure of solution PX +PgX
Vapour pressure of solution (2451)(0.0662) +(725) (0.93375)
Vapour pressure of solution 162.25 +676.96
Vapour pressure of solution 839.21
Vapour pressure of pentane is calculated as follows.
Vapour pressure of pentane solution mole fraction x vapour pressure.
Vapour pressure of solution PXA
Vapour pressure of solution (2451) (0.0662)
Vapour pressure of solution -162.25
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Mole fraction of ethanol is given below, Mole fraction nAn + 1.9535 Mole fraction (0.1386)+ (1.9535) Mole fraction 0.93375 Vapour pressure is calculated as follows Vapour pressure of solution mole fraction xvapour pressure. Vapour pressure of solution PX +PgX Vapour pressure of solution (2451)(0.0662) +(725) (0.93375) Vapour pressure of solution 162.25 +676.96 Vapour pressure of solution 839.21 Vapour pressure of pentane is calculated as follows. Vapour pressure of pentane solution mole fraction x vapour pressure. Vapour pressure of solution PXA Vapour pressure of solution (2451) (0.0662) Vapour pressure of solution -162.25

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