Reference no: EM132412964

1) What is the mass of water (in g) at 100 °C that can be completely boiled into liquid water at 100°C by a 91 g aluminum block at temperature 366 °C? Assume the aluminum is capable of boiling the water until its temperature drops below 100 °C.

The heat capacity of aluminum is 0.903 J g-1 °C-1 and the heat of vaporization of water at 100°C is 40.7 kJ mol-1.

Please show your steps and express your answer to 3 significant figures.

2) Which of the following properties of a molecular compound can largely be explained by its intermolecular forces?

Select as many as are applicable however points will be deducted for incorrect answers.

Select one or more:

a) Solubility in various solvents

b) Covalent bond strengths

c) Hybridization of the atoms

d) Vapor pressure

e) Melting point

f) Enthalpy of combustion

g) Boiling point

3) Which of the following are TRUE statements regarding evaporation, boiling, and vapor pressure?

Select as many as are applicable however points will be deducted for incorrect answers.

Select one or more:

a) As a liquid is boiling, its temperature will not change

b) It is impossible for a liquid to evaporate below its boiling point

c) The vapor pressure at dynamic equilibrium in a closed container depends on the surface area of the liquid

d) The normal boiling point occurs when the vapor pressure of a compound equals 1 bar

e) The vapor pressure at dynamic equilibrium in a closer container does not depend on the amount of liquid, as long as some liquid is always present

f) The rate of evaporation at temperatures below the boiling point is dependent on surface area

g) The standard boiling point occurs when the vapor pressure of a compound equals 1 bar

4) Consider the following experimental boiling points:

CH2F2: -52°C

CH2Cl2: 40°C

CH2Br2: 98°C

CH2I2: 182°C

Select one or more:

a) The molecule with the strongest intermolecular forces is CH2F2

b) The dominant effect behind this trend is the strength of dipole/dipole forces

c) CH2F2 is the most polarizable molecule of the four

d) The dominant effect behind this trend is the strength of dispersion forces

e) The C-I bond is the strongest covalent bond among the four molecules

f) CH2I2 is the most polarizable molecule of the four

5) Consider the following experimental boiling points:

CH4: -162°C

C3H8: -42°C

C6H14: 69°C

C9H20: 151°C

Which of the following statements is correct for this set of compounds and supported by the data given? Select as many as applicable.

Select one or more:

a) The C-C bond is the strongest covalent bond among the four molecules

b) C9H20 is the most polarizable molecule of the four

c) The dominant effect behind this trend is the strength of dipole/dipole forces

d) The molecule with the strongest intermolecular forces is C9H20

e) The dominant effect behind this trend is the strength of dispersion forces

f) CH4 is the most polarizable molecule of the four