Lecture_24_111011

# Lecture_24_111011 - Lecture 24 Solutions • Goals Identify...

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Unformatted text preview: Lecture 24: Solutions • Goals: Identify the solute and solvent in a solution. Identify solutes as electrolytes or nonelectrolytes. • Outline (Timberlake 7.9, 8.1-8.2):- Partial Pressures (7.9)- Solutions (8.1)- Electrolytes and Nonelectrolytes (8.2) • Problems for Extra Practice: 8.1, 8.5, 8.7, 8.9, 8.11, 8.13, 8.15, 8.17, 8.19 Guide to Solving for Partial Pressure Learning Check A scuba tank contains O 2 with a pressure of 0.450 atm and He at 855 mmHg. What is the total pressure in mmHg in the tank? For a deep descent, a scuba diver uses a mixture of helium and oxygen with a total pressure of 8.00 atm. If the oxygen has a partial pressure of 1280 mmHg, what is the partial pressure of the helium? 1) 520 mmHg 2) 2040 mmHg 3) 4800 mm Hg Learning Check Gases We Breathe The air we breathe • is a gas mixture • contains mostly N 2 and O 2 and small amounts of other gases A. If the atmospheric pressure today is 745 mmHg, what is the partial pressure (mmHg) of O 2 in the air? 1) 35.6 mmHg 2) 156 mmHg 3) 760 mmHg B. At an atmospheric pressure of 714 mmHg, what is the partial pressure (mmHg) of N 2 in the air? 1) 557 mmHg 2) 9.14 mmHg 3) 0.109 mmHg Learning Check Learning Check A 2.00 L flask contains 3.00 g of CO 2 and 0.10 g of helium at a temperature of 17.0 o C. What are the partial pressures of each gas and the total pressure in the flask? Solutions: Solute and Solvent Solutions • are homogeneous mixtures of two or more substances • consist of a solvent and one or more solutes Solutes • spread evenly throughout the solution • cannot be separated...
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Lecture_24_111011 - Lecture 24 Solutions • Goals Identify...

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