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Calculating moles of reactants and products and interchanging between volume and moles at constant pressure

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The following reaction is used in laboratories to produce oxygen: 2KclO3 (s) + 2KCl (s) + 3O2 (g) At 25 degrees Celsius and one atmosphere pressure, how many liters of O2 gas will be produced from the reaction of 165g of KClO3?

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To be able to solve this problem we need to realize that one thing that can be compared between reactants and products is the number of moles. Since looking at the stoichiometric cooficients we see that every 2 KClO3 moles produce 3 O2 moles we ca safely establish the following

2 moles KCLO3 ...

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