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Solid potassium chlorate (KClO3) was placed in an evacuated closed 1.00 L flask which was then...

Solid potassium chlorate (KClO3) was placed in an evacuated closed 1.00 L flask which was then heated to 400°C to completely decompose the KClO3 to form solid potassium chloride and oxygen gas. The resulting pressure of the oxygen gas in the flask at 400°C was determined to be 1.35 atm. How many grams of the KClO3 was initially placed in the flask ?

(1) 1.0g (2) 2.0g (3) 3.0g (4) 4.0g (5) 5.0g

The answer is 2.0 g but I'm not sure why.

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