Item 19 Given the data, calculate S vap for each liquids. ( S vap= H vap/T, wher

Question

Item 19

Given the data, calculate Svap for each liquids. (Svap=Hvap/T, where T is in K)

Part A

Diethyl ether

Express your answer with the appropriate units.

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Part B

Acetone

Express your answer with the appropriate units.

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Part C

Benzene

Express your answer with the appropriate units.

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Part D

Chloroform

Express your answer with the appropriate units.

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Part E

Ethanol

Express your answer with the appropriate units.

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Part F

Water

Express your answer with the appropriate units.

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Compound Name BP(C) Hvap(kJ/mol)atBP C4H10O Diethyl ether 34.6 26.5 C3H6O Acetone 56.1 29.1 C6H6 Benzene 79.8 30.8 CHCl3 Chloroform 60.8 29.4 C2H5OH Ethanol 77.8 38.6 H2O Water 100 40.7

Explanation / Answer

A) diethyl ether

given

boiling point (T) = 34.6 C

T = 34.6 + 273

T = 307.6 K

now

dS vap = dH vap / T

dS vap = 26.5 x 1000 / 307.6

dS vap = 86.15 J /mol

B) acetone

T = 56.1 + 273

T = 329.1

dS vap = 29.1 x 1000 / 329.1

dS vap = 88.42 J /mol

C) benzene

T = 79.8 + 273

T = 352.8

dS vap = 30.8 x 1000 / 352.8

dS vap = 87.3 J/mol

D)

chloroform

T = 60.8 + 273

T = 333.8

dS vap = 29.4 x 1000 / 333.8

dS vap = 88.077 J /mol

E) ethanol

T = 77.8 + 273

T = 350.8

now

dS vap = 38.6 x 1000 / 350.8

dS vap = 110.03 J /mol

F) water

T = 100 + 273

T = 373 K

now

dS vap = 40.7 x 1000 / 373

dS vap = 109.11 J /mol

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