How many dm3 produced in 20 g KClO3?
2KCl + 3O2 =2KClO3
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The balanced chemical equation for this decomposition reaction looks like this
2KClO3(s]heat×−−−→2KCl(s]+3O2(g]↑⏐⏐
Notice that you have a 2:3 mole ratio between potassium chlorate and oxygen gas.
This tells you that the reaction will always produce 32 times more moles of oxygen gas than the number of moles of potassium chlorate that underwent decomposition.
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