By using water displacement method, 128 mL of oxygen gas was collected from the  decomposition of potassium chlorate at 24oC and atmospheric pressure of 762 mm Hg.  Calculate the mass of the oxygen gas obtained. The vapour pressure of water at 24oC  was 24 mm Hg.

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By using water displacement method, 128 mL of oxygen gas was collected from the 
decomposition of potassium chlorate at 24oC and atmospheric pressure of 762 mm Hg. 
Calculate the mass of the oxygen gas obtained. The vapour pressure of water at 24oC 
was 24 mm Hg.

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