The Production of Oxygen in Laboratories

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?

See attachment for better equation.

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...-----> 3 moles O2
x moles KClO3 -----> how many moles of O2?
Doing the cross multiplication between these above we can say that number of moles of oxygen produced = 3x/2

Since we have 165g KClO3, we can use the molar mass of KClO3 to find the moles. since m=MMxmoles, so the number of ...