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2 KCLO3 -------> 2 KCl + 3O2
0.25 mol KCLO3 x 3 mol O2 / 2 mol KCLO3 x 32 g O2 / 1 mol O2 = 12 g O2
o mejor si no entiendes..
los 32 g son el peso molecular del oxigeno
16 x 2 = 32 g/ mol