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Exam 12: Intermolecular Forces and Liquids and Solids

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Question 31

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Which one of the following substances is expected to have the highest boiling point?

A) Br₂
B) Cl₂
C) F₂
D) I₂

E) A) and C)
F) A) and D)

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Question 32

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Use the following data to determine the molar heat of vaporization of chlorine. T (°C) -84.5 -71.2 -47.3 P (mmHg) 40.0 100.0 400.0

A) 34,700 J
B) 21,900 J
C) 317 J
D) 712 J
E) 9.99 kJ

F) A) and C)
G) B) and E)

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Question 33

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Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1,809 K) , given that $\Delta$ H_fus = 13.80 kJ/mol.

Of the given pair of compounds, which would have the higher boiling point? CCl₄ or CH₄

The molar enthalpy of vaporization of hexane (C₆H₁₄) is 28.9 kJ/mol, and its normal boiling point is 68.73°C. What is the vapor pressure of hexane at 25°C?

Which of the following substances should have the lowest boiling point?

Indicate all the types of intermolecular forces of attraction in SF₆(g).

For which of the following species are the dispersion forces strongest?

Identify the dominant (strongest)type of intermolecular force present in RbCl(s).

Which one of the following substances crystallizes as a molecular solid?

Calculate the amount of enthalpy required to heat 25.0 g of solid benzene (C₆H₆)at -10°C to liquid benzene at 20.0°C. Thermodynamic data for benzene: specific heat of solid benzene = 1.52 J/g·°C; specific heat of liquid benzene = 1.73 J/g·°C; melting point = 5.5°C; $\Delta$ H_fus = 9.9 kJ/mol.

The vapor pressure of a liquid in a closed container depends upon

Which of the following liquids would have the lowest viscosity at 25°C?

Which one of the following crystallizes in a metallic lattice?

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Ethanol and dimethyl ether have the same molecular formula, C₂H₆O. Ethanol boils at 78.4°C. Dimethyl ether boils at -23.7°C. Their structural formulas are, respectively, CH₃CH₂OH and CH₃OCH₃. Explain why the boiling point of the ether is so much lower than the boiling point of ethanol.

Boron nitride, BN₃, melts at approximately at 3,000°C under high pressure. This material is almost as hard as diamond. What kind of crystal is this?

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm?

The number of nearest neighbors (atoms that make contact) around each atom in a face-centered cubic lattice of a metal is