GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Chemical Reactions & Quantities

Stoichiometry

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Stoichiometry deals with the numerical relationship between compounds in a balanced chemical equation.

Stoichiometry

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concept

Stoichiometry

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Stoichiometry

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Utilize the stoichiometric chart to do all your stoichiometric calculations.

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example

Stoichiometry Example 1

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Problem

The oxidation of chromium solid is represented by the following equation: 

 

How many moles of chromium (III) oxide are produced when 34.69 g Cr reacts with excess oxygen gas? 

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Problem

The reaction of potassium chlorate and sucrose is given below: 

If 2.33 x 10-7 formula units of potassium chlorate are reacted, how many grams of carbon dioxide will be produced? 

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Problem

If the density of ethanol, CH3CH2OH, is 0.789 g/mL, how many milliliters of ethanol are needed to produce 4.8 g of H2O in the following reaction?