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. ^$\circ$ C, what mass (in grams) of KMnO₄(s) should be decomposed
Assume the decomposition of KMnO₄(s) goes to completion.

A) 35.8 g
B) 34.8 g
C) 33.8 g
D) 32.8 g
E) None of the above

Correct Answer:

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