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

question 93

Short Answer

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?

---

Definitions:

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.