1. Module 6 Intro

1.16. Lesson 3 Intro

Lesson 3

Module 6—Stoichiometry

Lesson 3—Gas Stoichiometry

 

Get Focused

 

A photograph of a space shuttle on the launch pad. The fuel tank for the main engines is a large orange-coloured cylinder that is attached to the underside of the shuttle. At the top of the fuel tank is a white ring that indicates where hydrogen and oxygen are added into the fuel tank.

Photo courtesy Kennedy Space Center/NASA

The hydrogen and oxygen that power the main engines of the Space Shuttle during launch are placed into the large orange external fuel tank mounted to the shuttle (as seen in this photo). The white ring that appears at the top of the external fuel tank is used to transfer hydrogen and oxygen (as liquids) into the tank.

 

In Lesson 2 you discovered that stoichiometry can be used to predict the mass of each of these substances that needs to be placed into the external fuel tank. During the combustion of hydrogen and oxygen, the temperature of the main engines of the shuttle can exceed 3300°C. At these conditions, the water produced by the reaction would exist as a gas. As you may recall from your study in Module 4, gases may fluctuate in volume in response to the temperature and pressure at which they are contained.

 

Predicting the quantity of a gas that is involved in a chemical reaction must still involve the number of moles of substance; but, in this case, the number of moles will be measured using the pressure, volume, and temperature of the gas. Can you recall a relationship that includes these four variables? How would you use this relationship when predicting the quantity of a gaseous substance involved in a chemical reaction?

 

In this lesson you will use stoichiometry to predict the quantities of substances in chemical reactions that involve gases.

 

Essential Questions

  • How is the stoichiometric method applied to reactions that involve gases?

Module 6: Lesson 3 Assignment

 

Save a copy of the Module 6: Lesson 3 Assignment to your course folder. You will receive more information about how to complete this assignment later in the lesson.

 

You will also continue your work on Module Assessment (Part 3)—A Stoichiometry Calculator. You will submit the work you complete in this lesson to your teacher for feedback, and you will have the opportunity to revise and add to it in other lessons. Remember to keep a copy of your Stoichiometry Calculator in your Chemistry 20 course folder so you can revise it as you work through this module.

 

You must decide what to do with the questions that are not marked by the teacher.

 

Remember that these questions provide you with the practice and feedback that you need to successfully complete this course. You should respond to all the questions and place those answers in your course folder.