Take out a piece
of paper and a pencil and go through this example with me. We will use algebra to solve for the coefficients. It's a 6-step process.

When propyl alcohol, CH_{3}CH_{2}CH_{2}OH,
burns in air, it reacts with oxygen, O_{2}, to form carbon dioxide,
CO_{2}, and water, H_{2}O. Write the balanced chemical
reaction.

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.