CHEM 1P92 Assignment 12A (Solutions). Version # 34
1.
Fill in the blanks in the table for aqueous solutions of the compounds shown. The density of the solution
is in g/mL. Abbreviations: m is molality, Mass % is the mass percentage of the solute, Mole Frac. is the mole
fraction of the solute, and M is molarity of the solute.
Compound f.w. d. soln. C H 3C O 2H
HCl
KI 60.05
36.47
166.03 1.0052
1.1791
1.1284 m Mass % Mole Frac. M 5.000
15.42
1.087 CHEM 1P92 Assignment 12B (Liquids, Solids, and Intermolecular Forces). Version # 34
1.
Draw Lewis structures for the following compounds. Remember to enclose ions in square brackets. On
your answer sheet, state the number of valence electrons in each compound.
(a) CH 3 I
(b) CaCl 2
(c) Mg(NO 3 ) 2
2. List the most important (strongest) intermolecular force(s) that must be overcome to
(a) vaporize liquid CH 3 OH
(b) remove water of hydration from NiSO 4 • 7H 2 O
(c) melt solid KBr 3. Consider what happens when solid CsI dissolves in liquid CH 3 OH.
(a) What type of attractive forces must be overcome in the liquid CH 3 OH?
(b) What type of forces must be overcome in the solid CsI?
(c) What type of attractive forces are important when CsI dissolves in liquid CH 3 OH? 4. (a) Which of the ions Mg 2+ , Ca 2+ , K + will have the largest heat of hydration? Which the smallest?
(b) Of the two compounds MgCl 2 and NaCl, which has the stronger intermolecular forces?
(c) Of the two compounds H 2 O and CCl 4 , which has the stronger intermolecular forces? 5.
Calculate the heat (in kJ) required to transform 45.30 g of hydrogen peroxide from a solid at a
temperature of -0.4 °C to a gas at 186 °C. Report your answer to one decimal place. Data:
Molar mass of hydrogen peroxide, H 2 O 2 = 34.015 g/mol
Melting point = -0.4 °C
Boiling point = 150°C.
Enthalpy of fusion = 12.5 kJ/mol
Enthalpy of vaporization = 51.6 kJ/mol.
Molar heat capacity of the liquid phase = 89.1 J/mol • K
Molar heat capacity of the gas phase= 43.1 J J/mol • K.
6.
Make a plot of the heat transfer and temperature change for the system described in Question 5. Plot the
temperature on the y axis and the heat added on the x-axis. Label the parts of the graph (solid melts, liquid is
heated, etc.) Your graph will resemble Figure 11.39 in Tro, Fridgen and Shaw.
7.
A metal crystallizes in th e face-centered cubic crystal structure with a unit cell edge of 4.95 x 10 -8 cm.
The density of the metal is 11.3 g/cc.
(a) What is the mass, in grams, of a single atom of this element?
(b) What is the atomic weight of the element (g/mol).
(c) What is the radius, in cm, of an atom of the element?
8.
As a substance is subjected to pressure and/or temperature changes, it may undergo condensation,
deposition, freezing, melting, sublimation, or vaporization. (a) Consider the phase diagram shown below and s
tate the changes that take place upon going from points A to B to C to D.
(b) Is the transition from B to C exothermic or endothermic? Pressure CHEM 1P92 Assignment 12B. Liquids, Solids, and Intermolecular Forces A B D C Temperature 9. Molybdenum crystallizes in the body-centered cubic structure with an edge length of 314.7 pm.
(a) Calculate the radius (in pm) of an atom of Mo to 4 significant figures.
(b) Calculate the density of the metal to 4 significant figures.

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