CHAPTER 3 MAKE UP PROBLEMS

CHAPTER 3 MAKE UP PROBLEMS - + H 2 O (l) SiO 2 (s) + Ca(HCO...

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CHAPTER 3 MAKE UP PROBLEMS 1. An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9028 amu and a relative abundance of 57.4 %, and isotope 2 has a mass of 122.9042 amu. Find the atomic mass of this element and, by comparion to the periodic table, identify it. 2. How many helium atoms are there in a helium blimp containing 536 kg of helium? 3. The mass of the average blueberry is 0.75 g and the mass of an automobile is 2.0 x 10 3 kg. Find the number of automobiles whose total mass is the same as 1.0 mol blueberries. 4. A sugar crystal contains approximately 1.8 x 10 17 sucrose (C 12 H 22 O 11 ) molecules. What is its mass in mg? 5. Combustion analysis of naphthalene, a hydrocarbon used in mothballs, produced 8.80 g CO 2 and 1.44 g H 2 O. Calculate the empirical formula for naphthalene. 6. When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide. Write a balanced chemical equation for this reaction. 7. Balance each of the following chemical equations: a. CO 2 (g) + CaSiO 3 (s)
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Unformatted text preview: + H 2 O (l) SiO 2 (s) + Ca(HCO 3 ) 2 (aq) b. Co(NO 3 ) 3 (aq) + (NH 4 ) 2 S (aq) Co 2 S 3 (s) + NH 4 NO 3 (aq) c. Cu 2 O (s) + C (s) Cu (s) + CO (g) d. FeS (s) + HCl (aq) FeCl 2 (aq) + H 2 S (g) 8. Estradiol is a female sexual hormone that causes maturation and maintenance of the female system. Elemental analysis of estradiol gave the following mass percent composition: C 79.37 %, H 8.88 %, O 11.75 %. The molar mass of estradiol is 272.37 g/mol. Find the molecular formula of estradiol. 9. For the reaction shown, calculate how many moles of NO 2 form when each of the following completely reacts: 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) a. 1.3 mol N 2 O 5 b. 5.8 mol N 2 O 5 c. 10.5 g N 2 O 5 d. 1.55 kg N 2 O 5 10. For the reaction shown, compute the theoretical yield of the product (in moles) for each of the following initial amounts of reactants: Ti (s) + 2 Cl 2 (g) TiCl 4 (s) a. 4 mol Ti, 4 mol Cl 2 b. 7 mol Ti, 17 mol Cl 2 c. 12.4 mol Ti, 18.8 mol Cl 2...
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