Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: An ionic compound forms when lithium (Z = 3) reacts with oxygen (Z = 8). If a sample of the compound contains 8.4×1021 lithium ions, how many oxide ions does it contain?

Solution: An ionic compound forms when lithium (Z = 3) reacts with oxygen (Z = 8). If a sample of the compound contains 8.4×1021 lithium ions, how many oxide ions does it contain?

Problem

An ionic compound forms when lithium (Z = 3) reacts with oxygen (Z = 8). If a sample of the compound contains 8.4×1021 lithium ions, how many oxide ions does it contain?

Solution

The reaction between a metal and oxygen produces a metal oxide.


Lithium forms lithium oxide when it reacts with oxygen. The reaction is:


<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>4</mn><msub><mi>Li</mi><mfenced><mi mathvariant="normal">s</mi></mfenced></msub><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><msub><mi mathvariant="normal">O</mi><mrow><mn>2</mn><mfenced><mi mathvariant="normal">g</mi></mfenced></mrow></msub><mo>&#xA0;</mo><mo>&#x2192;</mo><mo>&#xA0;</mo><mn>2</mn><msub><mi>Li</mi><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mfenced><mi mathvariant="normal">s</mi></mfenced></msub></math>


We have the following data:


Li+ ions in compound = 8.4x1021

O2- ions in compound = ?


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