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Unformatted text preview: Chapter 3 Stoichiometry of Formulas and Equations Created: 9:27:51 AM MST 1. Calcium fluoride, CaF 2 , is a source of fluorine and is used to fluoridate drinking water. Calculate its molar mass. A. 118.15 g/mol B. 99.15 g/mol C. 78.07 g/mol D. 59.08 g/mol E. 50.01 g/mol 5. Aluminum sulfate, Al 2 (SO 4 ) 3 , is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molar mass. A. 450.06 g/mol B. 342.15 g/mol C. 315.15 g/mol D. 278.02 g/mol E. 74.98 g/mol 9. What is the mass in grams of 0.250 mol of the common antacid calcium carbonate? A. 4.00 × 10 2 g B. 25.0 g C. 17.0 g D. 4.00 × 10-2 g E. 2.50 × 10-3 g 13. Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na 2 SO 4 . A. 1.244 × 10 23 O atoms B. 4.976 × 10 23 O atoms C. 2.409 × 10 24 O atoms D. 2.915 × 10 24 O atoms E. 1.166 × 10 25 O atoms 23. Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula? A. NH 2 O 5 B. N 2 H 4 O 4 C. N 3 H 3 O 3 D. N 4 H 8 O 2 E. N 2 H 2 O 4 25. A compound containing chromium and silicon contains 73.52 mass percent chromium. Determine its empirical formula. A. CrSi 3 B. Cr 2 Si 3 C. Cr 3 Si D. Cr 3 Si 2 E. Cr 2 S 27. Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis it produced 1.471 g CO 2 and 0.226 g H 2 O. What is its empirical formula? ...
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