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
Sections
Empirical Formula
Molecular Formula
Combustion Analysis
Combustion Apparatus
Polyatomic Ions
Naming Ionic Compounds
Writing Ionic Compounds
Naming Ionic Hydrates
Naming Acids
Naming Molecular Compounds
Balancing Chemical Equations
Stoichiometry
Limiting Reagent
Percent Yield
Mass Percent
Functional Groups in Chemistry
Additional Practice
Molecular Models
Ionic and Covalent Compounds
Metal Alloys
Additional Guides
Theoretical Yield
Balancing Chemical Equations Worksheet
Limiting Reactant

A Combustion Apparatus vaporizes a sample into gases to later determine its formula.

Combustion Apparatus

Concept #1: Combustion Apparatus

Example #1: The compound that makes up an experimental jet fuel contains C, H and O. Suppose that in one experiment the combustion of 11.5 g of the liquid gave the following results:

Mass of CO2 absorber before combustion = 10.815 g

Mass of CO2 absorber after combustion = 32.815 g


Mass of H2O absorber before combustion = 10.110 g

Mass of H2O absorber after combustion = 23.610 g

Find the empirical formula of the unknown liquid.

Practice: Vitamin C (MW = 176.12 g/mol) is a compound containing C, H, and O found in citrus fruits. When a 1.000 g sample of Vitamin C is placed inside a combustion chamber and burned, the following information is obtained: 

Mass of CO2 absorber before combustion = 83.85 g    

Mass of CO2 absorber after combustion = 85.35 g                  

Mass of H2O absorber before combustion = 37.55 g

Mass of H2O absorber after combustion = 37.96 g

What is the molecular formula of Vitamin C?