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### Chapter 13.1-13.4 problems

November 28, 2011

What IMF(s) is/are present when…

a) KCl is dissolved in H2Ob) carnauba wax dissolves in castor oil

c) Methanol (CH3OH) vs CCl4

Which will have the highest concentration in diethyl ether ( ) ?

A. HCl (g) B. NaCl (s) C. H2O

Why will washing your face with soap make your face “dryer”? (clue: remember your lipbalm experiment)

When NH4Cl dissolves in water, the solution becomes colder…

- Is ΔHsol’n >, < or = to 0?
- Is ΔHlattice >, <, or = to ΔHhydration ?
- Is the dissolution mostly due to ΔH or ΔS of mixing?

CHARGE DENSITY affects ΔHhydration. Which one will have a higher (more negative) ΔHhydration?

- Na+ , Rb+
- Br-, I-
- Ca2+, Na+

Which one best describes the enthalpy diagram of dissolving KBr in hexane?

Henry’s Law constant (kH) of O2 in water at 20oC is 1.28 x 10-3 mol/L-atm.

- How many grams will dissolve in 2.50 L H2O that is in contact with pure O2 at 1.00 atm?
- How many grams will dissolve in 2.50 L H2O that is in contact with pure O2 at 0.209 atm?

Express the concentration of concentrated HCl (12M)? Assume density of solution to be that of water: 1.00g/mL

- Molality
- %w/w
- %v/v
- Mol fraction

Argon makes up 0.93% by volume of air. Calculate its solubility (in molars) in water at 20oC and 1.0 atm. (kH of Ar is 1.5x10-3 mol/L-atm)

How many grams of NaCl more is needed to prepare a 100.0 mL of 0.1000 molal from 100.0 mL of 0.1000 molar NaCl solution?

How many grams of water must be evaporated from a liter of solution to make a 20%(w/w) MgBr2 to make a 0.0010 molar solution?

You are to prepare 10.0mL 0.0430 M ethanol solution from a stock solution of 20% v/v ethanol. The density of ethanol is 0.789g/mL. How many mL of the stock solution should you use?

Air is 21%(w/w) oxygen. If the molar mass of air is 28.4 grams/mol, calculate the mol ratio of oxygen in the air.

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