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| Chemistry- PLEASE HELP ASAP |
abruhnsen |
09/27/07 |
A student heats a 2.8594 gram sample of a mixture that contains an unknown amount of potassium chlorate (KClO3) in a test tube in the presence of some MnO2 catalyst. The KClO3 in the mixture decomposes during the heating process, releasing its oxygen. After the sample has cooled the student finds the mass of the sample residue to be 2.1203 grams.
1. How many grams of oxygen atoms were in the KClO3 in the original sample?
2. How many moles of oxygen atoms is this?
3. How many moles of KClO3 must have been in the original sample?
4. How many grams of KClO3 must have been in the original sample?
5. What is the % of KClO3 in the original sample? |
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