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An analysis of an ionic compound yields 2.82g of sodium (Na; M=22.99 g/mol), 4.35g of chlorine (CI; M=35.45 g/mol), and 7.83g of oxygen (O; M=16.00 g/mol).
1. What is the total mass of the compound? A. 5.076g B. 15.00g C. 40.38g D. 80.12g
2. What is the percentage of sodium in the compound? A. 0.188% B. 1.88% C. 18.8% D. 18.8%
3. What is the percentage of chlorine in the compound? A. 0.029% B. 0.29% C. 2.90% D. 29.0%
4. What is the percentage of oxygen in the compound? A. 0.0522% B. 0.522% C. 5.22% D. 52.2%
5. How many moles of sodium is in the compound? A. 0.123 mol B. 1 mol C. 12.3 mol D. 15 mol
6. How many moles of chlorine is in the compound? A. 0.123 mol B. 1 mol C. 12.3 mol D. 15 mol
7. How many moles of oxygen is in the compound? A. 48 mol B. 4.9 mol C. 0.489 mol D. 0.05 mol
8. What is the chemical formula of the compound? A. NaCIO B. Na²CIO³ C. Na²Cl²0³ D. NaClO^4
9. What is the molar mass of the compound? A. 74.449 g/mol B. 122.44 g/mol C. 129.43 g/mol D. 164.88 g/mol
10. From the total mass and the molar mass of the compound, how many moles of the compound is present in the sample? A. 0.091 mol B. 0.116 mol C. 0.123 mol D. 0.201 mol
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