Introduction

Reaction stoichiometry deals with mass relationships between reactants and products. This page will hopefully help to demistify how to solve these types of chemical equations.

Before you are able to successfully compute these types of stochiometric problems you must be able to do the following:

Name compounds

Balance chemical equations

Calculate formula mass

Identify mole ratios

Science Standards Addressed in this Lesson

Now you are Ready to Begin!!

Here are the steps used to solve stochiometric Calculations. Remember there are always more than one way to do this and a few methods will be listed and demonstrated for your convenince:

(note we will be using the same example in each method)

In a photosynthesis reaction:what mass in grams of Carbon dioxide is needed to react with 5 moles of water?

write out the correct balanced equation.

6CO2 + 6H2O = C6H12O6 + 6O2

Underneath the balanced equation write in a vertical columns (g) for grams,( mol) for moles, and( su) for stochiometric unit.

6CO2 + 6H2O = C6H12O6 + 6O2

You may click on each symbol to obtain information related to each. (Note that in a stochiometric problems you must be given either the gram value or the mole value to start. If not you willbe given a way to determine that information. There can only be one unknown in a problem!!!)