The enthalpy of vaporization for ethanol (C₂H₅OH) is 43.3kJ/mol. How much heat, in kilojoules, is required to vaporize 115g of ethanol at 25^oC?

1.   ?    4.98x10³
2.   ?    108
3.   ?    17.4
4.   ?    650
5.   ?    43.3

How much heat, in kJ, is released when 15.8g of CH₃OH is condensed at 25^oC? (H_vap = 38.0kJ/mol)

1.   ?    18.8
2.   ?    -18.8
3.   ?    600
4.   ?    77.0
5.   ?    -600

The vapor pressure of water is 28.3mmHg at 28^oC. What mass of water vapor, in mg, would be present in a vapor volume of 600.mL at 28^oC?

1.   ?    19.5
2.   ?    16.3
3.   ?    175
4.   ?    9.05x10^-4
5.   ?    1.63x10^-2

Which of the following compounds is predicted to have the highest enthalpy of vaporization at room temperature?

1.   ?    H₂O
2.   ?    CH₄
3.   ?    CCl₄
4.   ?    C₆H₁₄
5.   ?    CO₂

Which of the following quantities would be largest (most positive)?

1.   ?    H_vap
2.   ?    H_fusion
3.   ?    H_sublimation
4.   ?    H_condensation
5.   ?    H_melting

Which of the following statements about water is incorrect?

1.   ?    The boiling point is much higher than expected.
2.   ?    There are much stronger intermolecular forces due to hydrogen bonding.
3.   ?    Solid (ice) is more dense than liquid (water).
4.   ?    The solid-liquid line in the phase diagrams has a negative slope.
5.   ?    Ice can sublimate at temperatures below 0^oC.

In which substance would the dispersion forces be weakest?

1.   ?    He
2.   ?    Ne
3.   ?    Ar
4.   ?    Kr
5.   ?    Xe

Which would have the lowest boiling point?

1.   ?    NH₃
2.   ?    OH₃
3.   ?    BF₃
4.   ?    CCl₄
5.   ?    NCl₃

Which notion is incorrect?

1.   ?    Dispersion forces are present in all molecular substances.
2.   ?    The greater the dipole moment, the stronger the dipole-dipole forces.
3.   ?    The polarizability of elongated molecules is greater than that of compact, more spherical molecules.
4.   ?    Polar molecules always have higher bioling points than nonpolar molecules.
5.   ?    Hydrogen bonding leads to the strongest intermolecular forces.

Which one of the following is not an allotrope of carbon?

1.   ?    graphite
2.   ?    diamond
3.   ?    fullerene
4.   ?    nanotubes
5.   ?    sand

Which of the following would have the greatest lattice energy?

1.   ?    MgO
2.   ?    LiF
3.   ?    NaCl
4.   ?    KBr
5.   ?    CsI

Tin crystallizes in a fcc arrangement. The atomic radius of a tin atom is 141pm. What is the volume of a unit cell of Sn, in cubic centimeters?

1.   ?    7.93x10^-24
2.   ?    6.34x10^-23
3.   ?    2.80x10^-24
4.   ?    2.24x10^-23
5.   ?    3.97x10^-24