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Common Gases Used in Laboratories Are Generally Obtained from Pressurized \rarr

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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) \rarr 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?


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