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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 51

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

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dipole-dip...

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Question 52

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Octane, C₈H₁₈, boils at 125°C as compared to water, which boils at 100°C.This information suggests that the dispersion forces in nonpolar octane molecules are stronger than dispersion forces and hydrogen bonding in water.

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Question 53

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Indicate all the types of intermolecular forces of attraction in CH₃OH(l).

W(s) is classified as which of the following?

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.

Given that the heat of vaporization of mercury is 59.0 kJ/mol and the vapor pressure of mercury is 0.0017 torr at 25°C, calculate the normal boiling point of mercury.

The vapor pressure of ethanol is 400 mmHg at 63.5°C.Its molar heat of vaporization is 39.3 kJ/mol.What is vapor pressure of ethanol, in mmHg, at 34.9°C?

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.

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol, and its normal boiling point is 91°C.What is the vapor pressure of BBr₃ at 20°C?

Glass is classified as which of the following?

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol.Estimate the value for the heat of sublimation.

Which one of the following crystallizes in a metallic lattice?

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

Which is expected to have a higher vapor pressure, C₈H₁₈ or C₄H₁₀?

Suppose the atoms in a two-dimensional crystal have the following arrangement: How many atoms are in one unit cell?

Which of following can form hydrogen bonds with water molecules? (1) Na⁺ (2) CH₃COOH (3) C₂H₆ (4) CH₃NH₂

BaCl₂ crystallizes such that the Ba²⁺ ions are in a face-centered cubic arrangement and the Cl^- ions are in the holes of the lattice (fluorite structure) .How many Cl^- ions are present in one unit cell of this crystal?

Octane is a liquid component of gasoline.Given the following vapor pressures of octane at various temperatures, estimate the boiling point of octane in Leadville, Colorado, where the atmospheric pressure is 496 mmHg. 400 mmHg @ 104°C, 500 mmHg @ 111°C, 600 mmHg @ 117°C, 700 mmHg @ 122°C, 760 mmHg @ 125°C

Palladium crystallizes in a face-centered cubic unit cell.Its density is 12.0 g/cm³ at 27°C.Calculate the atomic radius of Pd.

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.