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1. identify the ions in (NH4)2Cr2O7 2. For a nonmetal in Group 5A of the Periodic Table, the most common monatomic ion will have a charge of what? 3. What is the molar mass of ammonium sulfate? 4. How many moles are in 35.7 g of anhydrous copper (II)sulfate? 5. How many grams are in 0.0751 mol Br2? 6. What is the mass percent of chlorine in iron(II) chloride? 7. A molecule is found to contain 47.35% C, 10.60% H, and 42.05%O. What is the empirical formula for this molecule? 8. A 4.450 g sample of hydrated lithium iodide, LiI.xH2O, is dried in an oven. When the anhydrous salt is removed from the oven , its mass is 3.170 g. What is the value of x? 9. The reaction of calcium with elemental chlorine yields calcium chloride. Write a balanced chemical equation for this reaction. 10. What is the correct method for determining how many moles of calcium oxide are produced in the reaction of 10.g calcium with excess oxygen?

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