A Convenient Way to Produce Very High Purity Oxygen in the Laboratory

A convenient way to produce very high purity oxygen in the laboratory is to decompose KMnO₄(s)at high temperature according to the following chemical equation:
2KMnO₄(s) $\rarr$ K₂MnO₄(s)+ MnO₂(s)+ O₂(g)
If 2.50 L of O₂(g)is needed at 1.00 atm and 20.°C, what mass (in grams)of KMnO₄(s)should be decomposed? Assume the decomposition of KMnO₄(s)goes to completion.

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