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Cece

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What is the percent yield for the reaction of 3.74 g of Na and excess O2 if 5.34 g of Na2O2 was recovered in the laboratory?

83.2%

84.2%

85.2%

What is the percent yield for the reaction of 6.92 g of K and 4.28 g of O2 if 7.36 g of KO2 is recovered in the laboratory?

76.4%

77.4%

78.4%
 
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