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Exam 12: Intermolecular Forces and Liquids and Solids

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Question 71

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The mineral manganosite, manganese(II) oxide, crystallizes in the rock salt structure (the face-centered structure adopted by NaCl) with a density of 5.365 g/cm³. Find the unit cell edge length of manganosite.

A) 444.5 pm
B) 352.8 pm
C) 280.0 pm
D) 368.2 pm
E) 417.9 pm

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Question 72

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Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. What is the expected value for the heat of sublimation of acetic acid?

A) 35.1 kJ/mol
B) -13.5 kJ/mol
C) +13.5 kJ/mol
D) -35.1 kJ/mol
E) Not enough information is given to answer the question.

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Question 73

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Which of the following would be expected to have the lowest vapor pressure at room temperature?

What phase exists at the point labeled c?

Calculate the amount of heat that must be absorbed by 10.0 g of ice at -20°C to convert it to liquid water at 60.0°C. Given: specific heat (ice) = 2.1 J/g·°C; specific heat (water) = 4.18 J/g·°C; $\Delta$ H_fus = 6.0 kJ/mol.

Given the following compound and its boiling point, identify whether it is polar or nonpolar: HCl, -84.9°C.

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

Atoms share electrons.

Indicate all the types of intermolecular forces of attraction in CHCl₃(l).

Which one of the following is an example of a covalent network solid?

Which one of the following substances crystallizes as a covalent crystal?

The heat capacity of liquid water is 4.18 J/g·°C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67°C into 1.00 g of steam at 100°C?

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? CH₄ or CH₃OH

The meniscus for water is curved upward at the edges (i.e., it is "concave up"). Explain this phenomenon in terms of cohesion and adhesion.

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

Magnesium oxide, MgO, melts at 2,800°C and is very hard. The liquid conducts electricity very well. What kind of crystal is this?

Given the following compound and its boiling point, identify whether it is polar or nonpolar: Ar, -185.7°C.

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?