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Question 5.15: Oxygen gas generated by the decomposition of potassium chlor...

Oxygen gas generated by the decomposition of potassium chlorate is collected as shown in Figure 5.15. The volume of oxygen collected at 24°C and atmospheric pressure of 762 mmHg is 128 mL. Calculate the mass (in grams) of oxygen gas obtained. The pressure of the water vapor at 24°C is 22.4 mmHg.

Strategy To solve for the mass of O_{2} generated, we must first calculate the partial pressure of   O_{2}  in the mixture. What gas law do we need? How do we convert pressure of   O_{2}  gas to mass of   O_{2}  in grams?

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