Examlex
Small samples of oxygen gas needed in the laboratory can be generated by any number of simple chemical reactions, such as 2 KCl O3 (s) → 2 KCl (s) + 3 O2 (g)
What mass of oxygen (in grams) is produced when 122.6 g of KCl O3 (formula mass = 122.6 amu) takes part in this reaction?
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