# Quantitative Information from Balanced Equations

## Introduction

Remark: In a balanced equation, reactants and products are equivalent to each other.

### Example

Information from Balanced Equations
Equation2H2(g)+O2(g)2H2O (l)
Molecules2 Molecules H2+1 molecule O22 molecules H2O
Amount (mol):2 mols H2+1 mol O22 mols H2O

This is a balanced equation, hence we can say, 2 mol of H2 are equivalent to 1 mol of O2, and to 2 mol of H2O

Based on these equivalences, we can say that:
• Two mol of H2 are needed to produce 2 mol of H2O
• One mol of O2 is needed to produce 2 mol of H2O
• Two mol of H2 are needed for each 1 mol of O2 to produce 2 mol of H2O

Hence, if # mol of any reactant is known, # mol of the product can be calculated as long as both are represented in a balanced equation.

Note:
A balanced equation contains the correct # mol for each of the reactants and products.
If their masses (in grams) were given instead, these should be converted into mol using the conversion equation between them.

### Exercise

Exercise on Mass Produced from Burning Butane

Check your answers here: Solution to the Exercise on Mass Produced from Burning Butane