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Common gases used in laboratories are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally-used gases, it is sometimes easier just to prepare them chemically.For example, oxygen gas can be prepared by heating KMnO4(s)according to the following chemical reaction:
2KMnO4(s) K2MnO4(s)+ MnO2(s)+ O2(g)
The above procedure was carried out starting with 93.2 g of KMnO4, and it was later determined that all of the KMnO4 reacted according to the above equation except 11.7 g.What was the percent yield for the reaction?
Margin Of Error
A statistic expressing the amount of random sampling error in a survey's results, indicating a range within which the true population parameter is likely to lie.
Bushels
Bushels are a measure of volume used primarily in agriculture, especially in the United States, for dry commodities such as grains or produce.
Confidence
In statistics, the degree of certainty or probability that a parameter lies within a specified range of values.
Insecticide
A chemical substance used to kill insects.
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