Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s).

Question

The equation for the reaction is

Calculate how many grams of  can be produced from heating 

Answer 1

2KClO₃ ==> 2KCl + 3O₂ ... balanced equation

Using dimensional analysis:

19.1 g KClO₃ x 1 mol KClO₃/122.55 g x 3 mol O₂/2 mol KClO₃ x 32 g O₂/mol O₂ = 7.48 g O₂ (3 sig. figs.)