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Chemistry- Test 2 Review.docx

Chemistry- Test 2 Review.docx - 1 A 5.05 g sample of...

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1. A 5.05 g sample of quartz (SiO2 ) contains 2.36 g of silicon. What are the percentages of silicon and oxygen in quartz? 2. How many formula units are in 0.25 mole of Na 2 0? 3. Calculate the molar mass of CuSO 4 •5H 2 0
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4. If 8.53 x 10 24 molecules of a substance have a mass of 483 g, what is the molar mass of the substance? 5. How many oxygen atoms are in 75.0 g of SO 3 ? 6. What is the mass of 2.4 x 10 23 molecules of NO 2 ?
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7. Given the following molecular formulas, determine the empirical formula of each compound: N 2 0 5 , PC1 3 , H 2 0 2 , C 6 H 4 Cl 2 8. Acetic acid is the active ingredient in vinegar. It consists of 40.00% C, 6.714% H, and 53.29% 0. What is the empirical formula of acetic acid? 9. Butyric acid has a very unpleasant odor. It is present in some rotting foods, body odor and vomit. Butyric acid has a molar mass of 88.10
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g/mol and consists of 54.53% C, 9.153% H, and 36.32% 0. What is the molecular formula of butyric acid? 10. Calculate the molarity of a solution consisting of 75.0 g of KOH in 2.00 L of solution.
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