Note that your name for KClO3 is not approved by IUPAC.
2KClO3 ==> 2KCl + 3O2
mols KClO3 = grams/molar mass = 2.50/122.5 = ?
mols O2 = mols KClO3 x (3/2) = ? Then are 22.4 L/mole O2 produced at STP.
Post your work if you get stuck.
what volume of oxygen gas measures at s.t.p will be produced from the decomposition of 2.50g of potasium trioxochlorate (v) (K =39,Cl =35.5, O =16 molar volume of a gas at s.t.p =22.4dm-3
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