Moles review. 9. Which substance has the greatest molecular mass?

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1 Name: ate: 1. What is the gram-molecular mass of a compound if 5 moles of the compound has a mass of 100 grams?. 5 g. 20 g. 100 g. 500 g 2. Which quantity is equivalent to 39 grams of LiF?. 1.0 mole. 2.0 moles mole. 1.5 moles 3. What is the mass in grams of 1.00 mole of O 2 gas? The gram molecular mass of a 3 (PO 4 ) 2 is. 246 g. 279 g. 310 g. 342 g 5. What is the total number of moles contained in 115 grams of 2 H 5 OH? What is the total mass in grams of 0.75 mole of SO 2?. 16 g. 24 g. 32 g. 48 g 7. What is the total mass of atoms of helium gas? 9. Which substance has the greatest molecular mass?. H 2 O 2. NO. F 4. I What is the gram formula mass of a 3 (PO 4 ) 2?. 196 g. 214 g. 245 g g 11. ase your answer(s) to the following question(s) on the information and equation below. ntacids can be used to neutralize excess stomach acid. rand antacid contains the acid-neutralizing agent magnesium hydroxide, Mg(OH) 2. It reacts with Hl(aq) in the stomach, according to the following balanced equation: 2Hl(aq) + Mg(OH) 2 (s) Mgl 2 (aq) + 2H 2 O(l) In the space below, show a correct numerical setup for calculating the number of moles of Mg(OH) 2 (gram-formula mass = 58.3 grams/mole) in an 8.40-gram sample. 12. ase your answer(s) to the following question(s) Gypsum is a mineral that is used in the construction industry to make drywall (sheetrock). The chemical formula for this hydrated compound is aso 4 2H 2 O. hydrated compound contains water molecules within its crystalline structure. Gypsum contains 2 moles of water for each 1 mole of calcium sulfate. What is the gram formula mass of aso 4 2H 2 O? g g g g 8. What is the gram molecular mass of 1 mole of 3 H 5 (OH) 3?. 48 g. 58 g. 74 g. 92 g page 1

2 13. ase your answer(s) to the following question(s) The decomposition of sodium azide, NaN 3 (s), is used to inflate airbags. On impact, the NaN 3 (s) is ignited by an electrical spark, producing N 2 (g) and Na(s). The N 2 (g) inflates the airbag. What is the total number of moles present in a 52.0-gram sample of NaN 3 (s) (gram-formula mass = 65.0 gram/mole)? 18. The total number of molecules in 34.0 grams of NH 3 is equal to What is the total number of moles of oxygen atoms in 1 mole of N 2 O 3? 14. The molar mass of a(oh) 2 is g g g g 15. What is the total number of atoms in 1.0 mole of O 2? Which sample of O 2 contains a total of molecules at STP? moles moles grams grams 17. What is the total number of molecules in 1.0 mole of l 2 (g)? Given the reaction: a + 2H 2 O a(oh) 2 + H 2. How many moles of H 2 O are needed to exactly react with 2.0 moles of a? In the reaction N 2 + 3H 2 2NH 3, how many grams of H 2 are needed to produce exactly 1 mole of ammonia?. 1 g. 2 g. 3 g. 4 g 22. Given the reaction: 2NaOH + H 2 SO 4 Na 2 SO 4 + 2H 2 O What is the total number of moles of NaOH needed to react completely with 2 moles of H 2 SO 4? The maximum number of grams of potassium that can be obtained from 100 grams of KHO 3 is g g g. 100 g page 2

3 24. In the reaction Fe 2 O 3 + 3O 2Fe + 3O 2, what is the total number of moles of O used to produce 112 grams of iron? 28. Which pair of formulas represents the empirical formula and the molecular formula of a compound? Given the reaction: Mg + 2Hl Mgl 2 + H 2 What is the total number of grams of Mg consumed when 0.50 mole of H 2 is produced?. 6.0 g. 12 g. 3.0 g. 24 g. H 2 O, 4 H 6 O 4. HO, 6 H 12 O 6. H 4, 5 H 12. H 2, 3 H Which represents both an empirical and a molecular formula?. P 2 O 5. N 2 O 4. 3 H 6. 6 H 12 O ase your answer(s) to the following question(s) on the information below, which describes the smelting of iron ore, and on your knowledge of chemistry. In the smelting of iron ore, Fe 2 O 3 is reduced in a blast furnace at high temperature by a reaction with carbon monoxide. rushed limestone, ao 3, is also added to the mixture to remove impurities in the ore. The carbon monoxide is formed by the oxidation of carbon (coke), as shown in the reaction below: 2 + O 2 2O + energy Liquid iron flows from the bottom of the blast furnace and is processed into different alloys of iron. alance the equation for the reaction of Fe 2 O 3 and O below, using the smallest whole-number coefficients. 30. Which is an empirical formula?. 4 H 8. 2 H 2. H 2 O. H 2 O What is the empirical formula of a compound whose composition by mass is 50% sulfur and 50% oxygen?. SO. SO 2. SO 3. S 2 O What is the ratio by mass of sulfur to oxygen in SO 2?. 1 : 1. 1 : 2. 1 : 3. 1 : In a sample of solid a(no 3 ) 2, the ratio of barium ions to nitrate ions is Fe 2 O 3 + O Fe +. O 2 1 : 1. 1 : 2. 1 : 3. 1 : Given the balanced equation: 4l(s) + 3O 2 (g) 2l 2 O 3 (s) What is the total number of moles of O 2 (g) that must react completely with 8.0 moles of l(s) in order to form l 2 O 3 (s)? 34. Which is an empirical formula?. H 2 O 2. H 2 O. 2 H 2. 3 H 6 page 3

4 35. The graph shows the data collected during the heating of a 5.0 gram sample of a hydrated salt. Use the graph for the following problems. Mass of Salt (g) Heating Time (min) fter 60 minutes, how many grams of water appear to remain in the salt? What is the percent by mass of water present in 1.0 mole of aso 4 2H 2 O?. 10%. 12%. 21%. 79% 37. What is the percent composition by mass of sulfur in the compound MgSO 4 (gram-formula mass = 120. grams per mole)?. 20.%. 27%. 46%. 53% 39. ase your answer(s) to the following question(s) Litharge, PbO, is an ore that can be roasted (heated) in the presence of carbon monoxide, O, to produce elemental lead. The reaction that takes place during this roasting process is represented by the balanced equation below. PbO(s) + O(g) Pb(l) + O 2 (g) alculate the percent composition by mass of oxygen in litharge (gram-formula mass = grams per mole). Your response must include both a numerical setup and the calculated result. 40. The graph shows the data collected during the heating of a 5.0 gram sample of a hydrated salt. Use the graph for the following problems. Mass of Salt (g) Heating Time (min) What is the percent of water in the original sample? 38. What is the total number of moles of oxygen atoms present in 1 mole of Mg(lO 3 ) 2?. 82%. 60%. 30%. 40% page 4

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