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Chemistry 12.2

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12.2 Chemical Calculations

The effectiveness of car’s air bags is based on the rapid conversion of a small mass of sodium azide into a large volume of gas. The entire reaction occurs in less than a second. You will learn how to use a balanced chemical equation to calculate the amount of product formed in a chemical reaction.

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Chemical Calculations >

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Writing and Using Mole Ratios

Writing and Using Mole Ratios

How are mole ratios used in chemical calculations?

12.2

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Chemical Calculations > Writing and Using Mole Ratios

In chemical calculations, mole ratios are used to convert between moles of reactant and moles of product, between moles of reactants, or between moles of products.

12.2

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Chemical Calculations > Writing and Using Mole Ratios

Mole-Mole Calculations

A mole ratio is a conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles.

12.2

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Chemical Calculations > Writing and Using Mole Ratios

To determine the number of moles in a sample of a compound, first measure the mass of the sample. Then use the molar mass to calculate the number of moles in that mass.

12.2

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SAMPLE PROBLEM

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12.2

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SAMPLE PROBLEM

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12.2

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SAMPLE PROBLEM

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12.2

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SAMPLE PROBLEM

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12.2

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Practice Problems for Sample Problem 12.2

Problem Solving 12.12 Solve Problem 12 with the help of an interactive guided tutorial.

Slide 12 of 41

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Chemical Calculations > Writing and Using Mole Ratios

Mass-Mass Calculations

12.2

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SAMPLE PROBLEM

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12.3

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SAMPLE PROBLEM

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12.3

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SAMPLE PROBLEM

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12.3

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SAMPLE PROBLEM

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12.3

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Practice Problems for Sample Problem 12.3

Problem Solving 12.13 Solve Problem 13 with the help of an interactive guided tutorial.

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Chemical Calculations >

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Other Stoichiometric Calculations

Other Stoichiometric Calculations

What is the general procedure for solving a stoichiometric problem?

12.2

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Chemical Calculations > Other Stoichiometric Calculations

In a typical stoichiometric problem, the given quantity is first converted to moles. Then the mole ratio from the balanced equation is used to calculate the number of moles of the wanted substance. Finally, the moles are converted to any other unit of measurement related to the unit mole, as the problem requires.

12.2

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Chemical Calculations > Other Stoichiometric Calculations

Solution Diagram

12.2

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Chemical Calculations > Other Stoichiometric Calculations

Problem-Solving Approach

12.2

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Chemical Calculations > Other Stoichiometric Calculations

Simulation 13

Strengthen your analytical skills by solving stoichiometric problems.

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SAMPLE PROBLEM

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12.4

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SAMPLE PROBLEM

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12.4

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SAMPLE PROBLEM

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12.4

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SAMPLE PROBLEM

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12.4

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Practice Problems for Sample Problem 12.4

Problem Solving 12.15 Solve Problem 15 with the help of an interactive guided tutorial.

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SAMPLE PROBLEM

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12.5

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SAMPLE PROBLEM

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12.5

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SAMPLE PROBLEM

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12.5

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SAMPLE PROBLEM

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12.5

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Practice Problems for Sample Problem 12.5

Problem Solving 12.18 Solve Problem 18 with the help of an interactive guided tutorial.

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SAMPLE PROBLEM

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12.6

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SAMPLE PROBLEM

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12.6

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SAMPLE PROBLEM

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12.6

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SAMPLE PROBLEM

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12.6