Percent Purity? ?

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trojans_cheerchick

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A 9.12 g sample containing solid potassium chlorate and other inert impurities was heated in a test tube. The potassium chlorate in the sample completely decomposed into potassium chloride and oxygen gas. The oxygen produced was collected over water (similar to Figure 12-7 on page 452 of your textbook) at 21.0 °C when the atomospheric pressure was 757.9 torr. The volume of gas collected was
0.568 L. The vapor pressure of water at 21.0 °C is 18.65 torr. Calculate the percent purity of potassium chlorate in the original sample.
_____%
 
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