Percent Composition, Empirical Formula, Molecular Formula, Hydrates

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1 Name: Percent Composition, Empirical Formula, Molecular Formula, Hydrates Essential Questions How can one explain the structure, properties, and interactions of matter? How do substances combine or react to make new substances? How can we count items we cannot see? Learning Objectives Analyze quantitatively the composition of a substance (empirical formula, molecular formula, percent composition, and hydrates) Determine percent composition of a given compound Calculate empirical formula from mass or percent using experiment data Calculate molecular formula from empirical formula using molecular weight Perform calculations based on percent composition Determine the composition of hydrates using experimental data Packet Contents Notes 2 3 Reinforcement Pages 4 10 Packet Does NOT Include: In-Class Demonstrations In-Class Activities Lab Page 1 B. Mack

2 The Mole Extension Percent Composition, Empirical Formula, Molecular Formula, Hydrates Percent Composition Empirical Formula Molecular Formula VS. C 2 H 4 CH KI H 2 O Page 2 B. Mack

3 A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound hydrates is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. What is a hydrate? Naming Finding the Formula for a hydrate Step 1 Step 2 Step 3 A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. Page 3 B. Mack

4 Name: Date: Period: Worksheet: Percent Composition 1. What is the percent mass of Carbon and Oxygen in CO 2? 2. What is the percent composition of hydrogen in phosphoric acid, H 3 PO 4? 3. Which has a larger percent by mass of sulfur, H 2 SO 3 or H 2 S 2 O 8? 4. Determine the percent composition of each element in the following compounds a. Na 2 C 2 O 4 b. C 2 H 5 OH c. Aluminum oxide d. Potassium sulfate 5. Calculate the mass percent of bromine in 50.0 grams of potassium bromide. Page 4

5 Name: Date: Period: 6. Calculate the percentage of water in sodium carbonate decahydrate (Na 2 CO 3 10H2O) 7. Express the composition of each compound as the mass percent of its elements a. Sucrose (C12H22O11) b. Magnetite (Fe3O4) c. Aluminum sulfate 8. Calculate the percentage of Barium in BaCl 2 2H2O 9. What is the percent composition of sulfate in sodium sulfate? Page 5

6 Name: Date: Period: Worksheet: Empirical and Molecular Formulas Part I. Find the empirical formula for the following molecular compositions a. 88.8% copper; 11.2% oxygen b. 40% carbon; 6.7% hydrogen; 53.5% oxygen c. 92.3% carbon; 7.7% hydrogen d. 70.0% iron; 30.0% oxygen e. 5.88% hydrogen; 94.12% oxygen f. 38.7% chlorine; 61.3% fluorine g. 7.19% phosphorus; 92.81% bromine h. 30.4% nitrogen; 69.6% oxygen Page 6

7 Name: Date: Period: Part II. a. Naphthalene is a carbon and hydrogen containing compound often used in moth balls. The empirical formula is C 5 H 4 and its molar mass is g/mol. Find the molecular formula. b. A compound with the following composition has a molar mass of g/mol % carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula. c. Monosodium glutamate, known as MSG, is sometimes added to food to enhance flavor. Analysis determined this compound to be 35.5% C, 4.77% H, 8.29% N, 13.6% Na, and 37.9% O. What is the molecular formula? d. A compound contains 18.8% sodium, 29.0% chlorine and 52.2% oxygen, by mass. If the molar mass of the compound is g/mol, determine the empirical and molecular formulas. e. A certain compound has an empirical formula of ClCH 2 and has a molecular weight g/mol. What is its molecular formula? Page 7

8 Name: Date: Period: Worksheet: Hydrates Part I. Name the following hydrates a. FeCl 3 6H2O b. CuSO 4 5H2O c. MgCrO 4 5H2O d. MnBr 4 4H2O e. barium chloride dehydrate f. magnesium sulfate heptahydrate g. tin (IV) chloride pentahydrate h. barium hydroxide octahydrate i. mercury (I) nitrate monohydrate Part II. Table 1 shows data from an experiment to determine the formulas of hydrated barium chloride. Determine the formula for the hydrate and its name Data for BaCl 2 xh 2 O Mass of empty crucible Mass of hydrate + crucible Initial mass of hydrate Mass after heating 5 min Mass of anhydrous solid g g g Part III. The hydrated form of nickel (II) chloride is a green compound commonly found in the chemistry laboratory. If a 5.00 gram sample of hydrated nickel (II) chloride loses 2.27 grams of water when heated, what is the formula of the hydrate? Name the hydrate. Page 8

9 Name: Date: Period: An gram sample of common hydrate of cobalt (II) chloride is heated. After heating, mole of anhydrous cobalt chloride remains. What is the formula and the name of this hydrate. Chromium (III) nitrate forms a hydrate that is 40.50% water by mass. What is its chemical formula? If 125 grams of magnesium sulfate heptahydrate is completely dehydrated, how many grams of anhydrous magnesium sulfate will remain? A calcium chloride hydrate has a mass of 4.72 grams. After heating for several minutes, the mass of the anhydride is found to be 3.56 grams. Use this information to determine the formula for the hydrate. A sample of copper (II) sulfate hydrate has a mass of 3.97 grams. After hearing, the copper (II) sulfate that remains has a mass of 2.54 grams. Determine the correct formula and name the hydrate. A gram sample of a hydrate of magnesium iodide is heated until its mass is reduced to grams and all water has been removed? What is the formula of the hydrate? Page 9

10 Determining the Formula of a Hydrate Chem Worksheet 11-6 Name A hydrate is an ionic compound that contains water molecules in its structure. To determine the formula of a hydrate experimentally, we must calculate the mole: mole ratio of the water portion compared to the anhydrate portion. An anhydrate is the substance that remains after the water is removed from a hydrate. When a hydrate is heated the water molecules are driven off as steam, leaving behind the water-free anhydrate. The first step to finding the formula for a hydrate is to record the mass of the hydrate. After heating the hydrate, the mass is determined for the anhydrate that remains. The mass of the water that was present is calculated by finding the difference between the mass of the hydrate and the mass of the anhydrate. The mass of the water and the mass of the anhydrate are each converted to moles using their respective molar masses. From this a whole number ratio can be determined (see example). Data Table Mass of hydrate (CaCl 2 xh 2O) 4.72 g Mass of anhydrate (CaCl 2) 3.56 g Mass of water 1.18 g Example A calcium chloride hydrate has a mass of 4.72 g. After heating for several minutes the mass of the anhydrate is found to be 3.56 g. Use this information to determine the formula for the hydrate. - find the mass of the water driven off: mass of hydrate mass of anhydrate = mass of water 4.72 g 3.56 g = 1.18 g - convert the mass of anhydrate to moles: 3.56 g CaCl 2 1 mol CaCl 2 = mol CaCl g CaCl - convert the mass of water to moles: 1.18 g H 2 O 1 mol H 2 O = mol H O g H O - find the mole H 2O to mole CaCl 2 ratio: mol H 2 O 2 mol H 2 O mol CaCl 2 1 mol CaCl 2 Since the compound contains 2 moles of water for every 1 mole of anhydrate the formula is CaCl 2 2 H 2O Solve the following problems. Show work to support your answer. 1. A hydrate of magnesium sulfate has a mass of g. This sample is heated until no water remains. The magnesium sulfate anhydrate has a mass of 6.60 g. Find the formula and name of the hydrate. 2. A sample of copper (II) sulfate hydrate has a mass of 3.97 g. After heating, the copper (II) sulfate that remains has a mass of 2.54 g. Determine the correct formula and name of the hydrate. 3. When 5.00 g of iron (III) chloride hydrate, 2.00 g of H2O are driven off. Find the chemical formula and the name of the hydrate. 4. A sample of the hydrate of sodium carbonate has a mass of 8.85 g. It loses 1.28 g when heated. Find the formula and the name of the hydrate. 5. A 16.4 g sample of hydrated calcium sulfate is heated until all the water is driven off. The calcium sulfate that remains has a mass of 13.0 g. Find the formula and the chemical name of the hydrate. 6. When 8.00 g of lead (II) acetate hydrate is heated, 1.14 g of H2O are driven off. Find the chemical formula and the name of the hydrate. 7. A hydrate is determined to be 45.43% water and 54.57% Cobalt (II) chloride. Find the chemical formula and name for this hydrate. Page 10

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