# Have Your Students Learn Stoichiometry Online

## Practice with intelligent computer tutors, explore solved problems, and study instructional videos

Click the links below to solve stoichiometry problems using an intelligent computer tutor. Each tutor link will open in a new window.

1. Tutor 1
Can you tell me how many grams (g) are in 10.6 milligrams (mg) of wood alcohol (COH4)? Your result should have 3 significant figures.
2. Tutor 2
A water supply has become contaminated with alcohol (COH4). To determine the extent of the contamination, one needs to determine the number of moles of alcohol / kg of H2O in a solution of 6.00 grams COH4 in 100.0g of H2O. The result should have 3 significant figures. (Hint: the molecular weight of COH4 is 32.04 g COH4 / mol of COH4).
3. Tutor 3
If you were to take the mineral hematite (Fe2O3) and cause a reaction with carbon, you could produce iron metal. Can you calculate and tell me how many grams of iron are present in a gram of hematite? Your result should have 5 significant figures. (Here are two hints to help you: the molecular weight of Fe is 55.847 g Fe / mol Fe and the molecular weight of Fe2O3 is 159.692 g Fe2O3 / mol Fe2O3.)

Participate:bmclaren@cs.cmu.edu

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