  UNIT # 8  Introduction  Objectives  Reading 8.1 Conventions and Symbols 8.2 Balancing Chemical Equations 8.3 Methods of Balancing Equations     8.4 Types of Chemical Reactions 8.5 Calculations Based on Chemical Equations         Problems 1 | 2 | 3 | 4 CHEMICAL REACTIONS

8.3 - Methods of balancing chemical equations

8.3.2 - Balance Algebraically

 When propyl alcohol, CH3CH2CH2OH, burns in air, it reacts with oxygen, O2, to form carbon dioxide, CO2, and water, H2O. Write the balanced chemical reaction.

If you think you know how to do this, skip to see the balanced chemical equation.

Otherwise, let's begin:

 Step 1 Identify the reactants and products. Step 2 Write the unbalanced chemical equation. Step 3 Assign variables as coefficients for each substance in the chemical equation. Step 4 Determine the number of each type of atoms on each side of the arrow. Step 5 Write out the algebraic equations and solve for the coefficients. Step 6 Make sure that all the coefficients are whole numbers. Multiply all the coefficients by an appropriate factor to convert any fractions to whole numbers.

### The balanced chemical equation is:

 2 CH3CH2CH2OH (l) + 9O2 (g) 6CO2 (g) + 8H2O (l) Section 9.3 Guidelines for Balancing Chemical Equations ..p219

Section 9.4 Examples Involving Balancing Equations ..p221 Back Next  All contents copyrighted © 1996-2006 British Columbia Institute of Technology Chemistry Department - 3700 Willingdon Avenue Burnaby, B.C. Canada V5G 3H2