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