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# ch3questions - CHAPTER 3 QUESTIONS Simple Moles 1(A 2(A 3 A...

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CHAPTER 3 - QUESTIONS Simple Moles 1. A 0.100 mole sample of ethene, C 2 H 4 , contains how many atoms? (A) 6.02 x 10 22 (B) 3.61 x 10 23 (C) 3.61 x 10 22 (D) 3.61 x 10 24 (E) 6.02 x 10 23 2. 8.55 x 10 -3 moles of an unknown compound has a mass of 0.137 g. The compound could be: (A) CH 4 (B) C 2 H 6 (C) C 3 H 8 (D) C 4 H 10 3. A sample of an unknown element has a mass of 2.14 x 10 -4 g and contains 1.2751 x 10 18 atoms. From this information, the element could be: (A) Zr (B) Nb (C) Mo (D) Tc (E) Ru Empirical Formula 4. When an electric discharge is passed through boron trichloride a new compound is formed. What is its simplest formula if on analysis it is shown to contain 0.0878 g of chlorine and 0.0131 g of boron? (A) BCl (B) BCl 2 (C) BCl 3 (D) B 2 Cl 3 5. A hydrocarbon (C x H y ) was burned completely in air yielding 0.18 g of water and 0.44 g of carbon dioxide. Which formula could give such data? (A) C 2 H 2 (B) C 2 H 4 (C) C 2 H 6 (D) C 6 H 6 6. The empirical formula of a compound containing 54.53% C, 9.15% H, and oxygen is (A) C 2 H 4 O (B) C 4 H 8 O 2 (C) C 4 H 9 O 2 (D) CHO (E) C 5 H 9 O 7. A compound contains 1.18% H, 42.0% Cl, and O. What is the empirical formula? (A) HCl (B) HClO (C) HClO 2 (D) HClO 3 (E) HClO 4 8. 1.567 g of titanium chloride was decomposed to 0.487 g of pure Ti. What is the empirical formula? (A) TiCl 2 (B) TiCl 3 (C) TiCl 4 (D) Ti 2 Cl 3 (E) TiCl 9. What is the empirical formula of a compound that is 49.4% K, 20.3% S, and 30.3% O? (A) K 2 SO 4 (B) KSO 2 (C) KSO 3 (D) KSO 4 (E) K 2 SO 3 10. Terephthalic acid is composed of C, H and O. When 0.6943 g of tetephthalic acid is subjected to combustion analysis, it produced 1.471 g CO 2 and 0.225 g H 2 O. What is its empirical formula? (A) C 4 H 6 O 4 (B) C 2 H 3 O 4 (C) C 3 H 4 O 2 (D) C 4 H 3 O 2 (E) C 5 H 12 O 4 1

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11. Which of the following statements is NOT true? (A) different compounds can have the same molecular formula (B) the empirical and molecular formulas of some compounds are equal (C) All compounds with the same empirical formula have the same molecular mass (D) Ribose (C 5 H 10 O 5 ) and lactic acid (C 3 H 6 O 3 ) have the same empirical formula (E) If the empirical formula of a compound is known, its molecular weight is needed to determine the
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ch3questions - CHAPTER 3 QUESTIONS Simple Moles 1(A 2(A 3 A...

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