chapter10 section02 mole–mass and mole–volume relationships by hamdy karim
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Students will learn how they calculate the number of moles of a substance and the mol of a gas at STP!TRANSCRIPT
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chemistry
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Mole–Mass and Mole–Volume Relationships
How can you guess the number of jelly beans in a jar? You estimate the size of a jelly bean and then estimate the dimensions of the container to obtain its volume. In a similar way, chemists use the relationships between the mole and quantities such as mass, volume, and number of particles to solve chemistry problems.
10.2
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Mole–Mass and Mole–Volume Relationships
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The Mole–Mass Relationship
The Mole–Mass Relationship
How do you convert the mass of a substance to the number of moles of the substance?
10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole–Mass Relationship
Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance.
10.2
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SAMPLE PROBLEM
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10.5
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10.5
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Practice Problems for Sample Problem 10.5
Problem Solving 10.16 Solve Problem 16 with the help of an interactive guided tutorial.
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10.6
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10.6
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10.6
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Practice Problems for Sample Problem 10.6
Problem Solving 10.18 Solve Problem 18 with the help of an interactive guided tutorial.
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The Mole–Volume Relationship
The Mole–Volume Relationship
What is the volume of a gas at STP?
10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole–Volume Relationship
Avogadro’s hypothesis states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole–Volume Relationship
The volume of a gas varies with temperature and pressure. Because of these variations, the volume of a gas is usually measured at a standard temperature and pressure.
Standard temperature and pressure (STP) means a temperature of 0°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).
10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole–Volume Relationship
At STP, 1 mol or, 6.02 1023 representative particles, of any gas occupies a volume of 22.4 L.
The quantity 22.4 L is called the molar volume of a gas.
10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole–Volume Relationship
Calculating Volume at STP
10.2
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10.7
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Practice Problems for Sample Problem 10.7
Problem Solving 10.20 Solve Problem 20 with the help of an interactive guided tutorial.
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Mole–Mass and Mole–Volume Relationships
> The Mole–Volume Relationship
Calculating Molar Mass from Density
10.2
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10.8
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Practice Problems for Sample Problem 10.8
Problem Solving 10.22 Solve Problem 22 with the help of an interactive guided tutorial.
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Mole–Mass and Mole–Volume Relationships
> The Mole Road Map10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole Road Map10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole Road Map10.2
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Mole–Mass and Mole–Volume Relationships
> The Mole Road Map
The Mole Road Map
10.2
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Mole–Mass and Mole–Volume Relationships
> Simulation 10
Simulation 10
Use the mole road map to convert among mass, volume, and number of representative particles.
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Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section
10.2 Section Quiz.
10.2.
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10.2 Section Quiz.
1. Calculate the mass in grams of a sample containing 1.85 x 1034 molecules of water.
a. 3.07 x 1010 g
b. 5.53 x 1011 g
c. 188 g
d. 8.46 x 103 g
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10.2 Section Quiz.
2. Calculate the number of moles in a spoonful of table sugar (C12H22O11) having a mass of 10.5 g.
a. 32.6 mol
b. 3.59 103 mol
c. 3.07 10–3 mol
d. 1.85 1022 mol
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10.2 Section Quiz.
3. What is the volume of 0.35 mol of oxygen gas at STP?
a. 32 L
b. 64 L
c. 7.8 L
d. 16 L
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