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- 1. Multiple ChoiceFind the percent composition of Cu2S?%Cu= 67.987 %S= 32.013%Cu= 79.854 %S= 20.145%Cu= 35.946 %S= 64.054
- 2. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 3. Multiple ChoiceWhich of the following is considered an empirical formula?CH3COOHC6H12O6H2O
- 4. Multiple ChoiceWhat is the percentage of oxygen in carbon dioxide? (CO2)27.3%72.7%30%70%
- 5. Multiple ChoiceYou are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.SOSO2SO3SO4
- 6. Multiple ChoiceWhat is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?C3H8CH4C2H2C4H10
- 7. Multiple ChoiceA formula with the lowest whole # ratio of elements in a compound is calledMolecular FormulaChemical FormulaEmpirical FormulaDistance Formula
- 8. Multiple ChoiceWhat is the percentage of chlorine in sodium chloride? (NaCl)60.7%39.3%60%40%
- 9. Multiple ChoiceWhat is the percentage of iron in iron(III)oxide?30%70%40%60%
- 10. Multiple ChoiceGiven the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.NaPO2Na2PO3Na3PO4NaPO4
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