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Preparing oxygen in the lab

Oxygen can be preparead in a lab by the reaction:
2KCLO3 = 2H2(g) + O2(g)
Question: How many grams of KCLO3 must be reacted to produce 100 g of O2?

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You cannot prepare O2 by the "reaction" given in the question.
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<br>Actually the chemical reaction for the preparation of o2 in the laboratory is
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<br>2KClO3 --> 2KCl + 3O2
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<br>From this we ...

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