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Answer :
Final answer:
The mass percent of oxygen in sodium oxide (Na2O) can be calculated by dividing the atomic mass of oxygen by the molar mass of Na2O and then multiplying by 100. This gives a mass percent of 25.8%, hence the correct answer is B) 25.8.
Explanation:
The mass percent of an element in a compound indicates the fraction of the total mass contributed by that element. To calculate it for oxygen in sodium oxide (Na2O), you first need to find the molar mass of sodium oxide. Sodium (Na) has an atomic mass of 23 g/mol and oxygen (O) has an atomic mass of 16 g/mol. Since there are two sodium atoms in sodium oxide, the total mass of sodium is 23 x 2 = 46 g/mol. Adding the mass of oxygen, the molar mass of Na2O is 46 + 16 = 62 g/mol. The mass percent of oxygen is then (16/62) x 100% = 25.8%. So, the answer is B) 25.8.
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