Humboldt State University ® Department of Chemistry

Richard A. Paselk

Chem 107	Fundamentals of Chemistry	Fall 2008
Lecture Notes: 30 October	© R. Paselk 2005
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Stoichiometry, cont.

Limiting Problems: Asking question of what is the maximum amount of something which can be produced from a given mixture of stuff. This is a fairly straight-forward sort of problem in the day-to-day world, but seems to cause a great deal of difficulty for lots of folks in chemistry. Let's start by looking at a non-chemical problem:

Pretend you are working at a bike shop and you are given the following inventory of parts:

Frame assembly + Handlebar + Seat + Wheel set + 2 Tires Bicycle

In this case the limiting factor is the frame, so only 4 can be assembled (lots of spare parts).

• Example: Consider the reaction:

Fe₃O₄ + 4 C 3 Fe + 4 CO

What is the maximum mass of Fe which could be made from 115.0 g Fe₃O₄ of and 24.00 g C?

Hydrogen-Oxygen stoichiometry demo.

Gases and Gas Laws

Gases: Briefly discussed overall properties of gases (fill container, have mass & volume, etc.). Also noted:

• Gas particles are elastic (otherwise would lose energy with collisions and collapse to a liquid).
• Gas particles exert pressure.

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Last modified 30 October 2008