Chapter 8 Empirical Molecular Formulas Types of Formulas
![Chapter 8 Empirical & Molecular Formulas Chapter 8 Empirical & Molecular Formulas](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-1.jpg)
![Types of Formulas • The molecular formula of a compound indicates the actual number Types of Formulas • The molecular formula of a compound indicates the actual number](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-2.jpg)
![Empirical and Molecular Formulas Substance Benzene Molecular Formula C 6 H 6 Empirical Formula Empirical and Molecular Formulas Substance Benzene Molecular Formula C 6 H 6 Empirical Formula](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-3.jpg)
![Chemical Formulas of Compounds • Chemical formulas give the relative numbers of atoms or Chemical Formulas of Compounds • Chemical formulas give the relative numbers of atoms or](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-4.jpg)
![To Calculate an Empirical Formula 1. Determine the mass in grams of each element To Calculate an Empirical Formula 1. Determine the mass in grams of each element](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-5.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-6.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-7.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-8.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-9.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-10.jpg)
![A sample of a brown gas, a major air pollutant, is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-11.jpg)
![To Calculate a Molecular Formula 1. Determine the empirical formula and calculate its mass. To Calculate a Molecular Formula 1. Determine the empirical formula and calculate its mass.](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-12.jpg)
![A colorless liquid, used in rocket engines has a molar mass of 92. 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-13.jpg)
![A colorless liquid, used in rocket engines has a molar mass of 92. 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-14.jpg)
![A colorless liquid, used in rocket engines has a molar mass of 92. 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-15.jpg)
![A colorless liquid, used in rocket engines has a molar mass of 92. 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-16.jpg)
![What is the empirical formula of a compound that contains 53. 73% Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-17.jpg)
![What is the empirical formula of a compound that contains 53. 73% Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-18.jpg)
![What is the empirical formula of a compound that contains 53. 73% Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-19.jpg)
![What is the empirical formula of a compound that contains 53. 73% Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-20.jpg)
![What is the empirical formula of a compound that contains 53. 73% Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-21.jpg)
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-22.jpg)
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-23.jpg)
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-24.jpg)
![What is the empirical formula for Ibuprofen if the percent composition is 75. 7% What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-25.jpg)
![What is the empirical formula for Ibuprofen if the percent composition is 75. 7% What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-26.jpg)
![What is the empirical formula for Ibuprofen if the percent composition is 75. 7% What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-27.jpg)
![What is the empirical formula for Ibuprofen if the percent composition is 75. 7% What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-28.jpg)
![What is the empirical formula for Ibuprofen if the percent composition is 75. 7% What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-29.jpg)
![What is the molecular formula for Ibuprofen if the molar mass is 206 g/mole? What is the molecular formula for Ibuprofen if the molar mass is 206 g/mole?](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-30.jpg)
![Homework • Percentage Composition Worksheet (due tomorrow). • Lab Summary: Determination of the Empirical Homework • Percentage Composition Worksheet (due tomorrow). • Lab Summary: Determination of the Empirical](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-31.jpg)
- Slides: 31
![Chapter 8 Empirical Molecular Formulas Chapter 8 Empirical & Molecular Formulas](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-1.jpg)
Chapter 8 Empirical & Molecular Formulas
![Types of Formulas The molecular formula of a compound indicates the actual number Types of Formulas • The molecular formula of a compound indicates the actual number](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-2.jpg)
Types of Formulas • The molecular formula of a compound indicates the actual number of each atom present in a compound. • An empirical formula of a compound indicates the smallest whole number ratio of the elements of each atom present in a compound.
![Empirical and Molecular Formulas Substance Benzene Molecular Formula C 6 H 6 Empirical Formula Empirical and Molecular Formulas Substance Benzene Molecular Formula C 6 H 6 Empirical Formula](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-3.jpg)
Empirical and Molecular Formulas Substance Benzene Molecular Formula C 6 H 6 Empirical Formula CH Acetylene C 2 H 2 CH Glucose C 6 H 12 O 6 CH 2 O Water H 2 O
![Chemical Formulas of Compounds Chemical formulas give the relative numbers of atoms or Chemical Formulas of Compounds • Chemical formulas give the relative numbers of atoms or](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-4.jpg)
Chemical Formulas of Compounds • Chemical formulas give the relative numbers of atoms or moles of each element in a compound which is always a whole number ratio. • Example CO 2 2 atoms of O for every 1 atom of C or 2 moles of O for every 1 mole of C • If we know or can determine the relative number of moles of each element in a compound, we can determine a formula for the compound.
![To Calculate an Empirical Formula 1 Determine the mass in grams of each element To Calculate an Empirical Formula 1. Determine the mass in grams of each element](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-5.jpg)
To Calculate an Empirical Formula 1. Determine the mass in grams of each element present, if necessary. 2. Calculate the number of moles of each element. 3. Divide each answer from step 2 by the smallest number of moles to obtain the simplest whole number ratio. 4. If whole numbers are not obtained* in step 3), multiply through by the smallest number that will give all whole numbers * Be careful! Do not round off numbers prematurely
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-6.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance.
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-7.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance. 2. 34 g N 5. 34 g O
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-8.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance. 2. 34 g N mol 14. 0 g 5. 34 g O = 0. 167 mol N mol = 0. 334 mol O 16. 0 g
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-9.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance. 2. 34 g N mol 14. 0 g 5. 34 g O = 0. 167 mol N mol = 0. 334 mol O 16. 0 g N 0. 167 O 0. 334
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-10.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance. 2. 34 g N mol 14. 0 g 5. 34 g O = 0. 167 mol N mol = 0. 334 mol O 16. 0 g 0. 167 mol N 0. 167 = 1 mol N N 0. 167 O 0. 334 mol O 0. 167 = 2 mol O
![A sample of a brown gas a major air pollutant is found to contain A sample of a brown gas, a major air pollutant, is found to contain](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-11.jpg)
A sample of a brown gas, a major air pollutant, is found to contain 2. 34 g N and 5. 34 g O. Determine a formula for this substance. 2. 34 g N mol 14. 0 g 5. 34 g O = 0. 167 mol N mol = 0. 334 mol O 16. 0 g 0. 167 mol N 0. 167 O 0. 334 mol O 0. 167 = 1 mol N NO 2 = 2 mol O
![To Calculate a Molecular Formula 1 Determine the empirical formula and calculate its mass To Calculate a Molecular Formula 1. Determine the empirical formula and calculate its mass.](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-12.jpg)
To Calculate a Molecular Formula 1. Determine the empirical formula and calculate its mass. 2. Divide the molecular mass by the mass of the empirical formula you determined in step 1. Your answer should be rounded to the nearest whole number. 3. Multiply the empirical formula by the whole number answer found in step 2.
![A colorless liquid used in rocket engines has a molar mass of 92 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-13.jpg)
A colorless liquid, used in rocket engines has a molar mass of 92. 0 g/mol. What is the molecular formula of the compound if the empirical formula is NO 2?
![A colorless liquid used in rocket engines has a molar mass of 92 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-14.jpg)
A colorless liquid, used in rocket engines has a molar mass of 92. 0 g/mol. What is the molecular formula of the compound if the empirical formula is NO 2? NO 2 = 14. 0 + 2(16. 0) = 46. 0 g/mol
![A colorless liquid used in rocket engines has a molar mass of 92 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-15.jpg)
A colorless liquid, used in rocket engines has a molar mass of 92. 0 g/mol. What is the molecular formula of the compound if the empirical formula is NO 2? NO 2 = 14. 0 + 2(16. 0) = 46. 0 g/mol 92. 0 g/mol =2 46. 0 g/mol
![A colorless liquid used in rocket engines has a molar mass of 92 0 A colorless liquid, used in rocket engines has a molar mass of 92. 0](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-16.jpg)
A colorless liquid, used in rocket engines has a molar mass of 92. 0 g/mol. What is the molecular formula of the compound if the empirical formula is NO 2? NO 2 = 14. 0 + 2(16. 0) = 46. 0 g/mol 92. 0 g/mol =2 46. 0 g/mol 2 x NO 2 = N 2 O 4
![What is the empirical formula of a compound that contains 53 73 Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-17.jpg)
What is the empirical formula of a compound that contains 53. 73% Fe and 46. 27% S?
![What is the empirical formula of a compound that contains 53 73 Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-18.jpg)
What is the empirical formula of a compound that contains 53. 73% Fe and 46. 27% S? 53. 73 g Fe 46. 27 g S
![What is the empirical formula of a compound that contains 53 73 Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-19.jpg)
What is the empirical formula of a compound that contains 53. 73% Fe and 46. 27% S? 53. 73 g Fe mol = 0. 963 mol Fe 55. 8 g 46. 27 g S mol = 1. 44 mol S 32. 1 g
![What is the empirical formula of a compound that contains 53 73 Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-20.jpg)
What is the empirical formula of a compound that contains 53. 73% Fe and 46. 27% S? 53. 73 g Fe mol = 0. 963 mol Fe 55. 8 g 0. 963 mol Fe 0. 963 mol = 1 Fe 46. 27 g S mol 32. 1 g 1. 44 mol S 0. 963 mol = 1. 44 mol S = 1. 5 S
![What is the empirical formula of a compound that contains 53 73 Fe and What is the empirical formula of a compound that contains 53. 73% Fe and](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-21.jpg)
What is the empirical formula of a compound that contains 53. 73% Fe and 46. 27% S? 53. 73 g Fe mol = 0. 963 mol Fe 55. 8 g 0. 963 mol Fe 0. 963 mol 46. 27 g S mol 32. 1 g 1. 44 mol S 0. 963 mol = 1 Fe Fe. S 1. 5 x 2 = Fe 2 S 3 = 1. 44 mol S = 1. 5 S
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-22.jpg)
What is the molecular formula of a substance with the empirical formula Fe 2 S 3 and a gram formula mass of 624 g/mol?
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-23.jpg)
What is the molecular formula of a substance with the empirical formula Fe 2 S 3 and a gram formula mass of 624 g/mol? Fe 6 S 9
![What is the molecular formula of a substance with the empirical formula Fe 2 What is the molecular formula of a substance with the empirical formula Fe 2](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-24.jpg)
What is the molecular formula of a substance with the empirical formula Fe 2 S 3 and a gram formula molecular mass of 624 g/mol? 2 Fe + 3 S = 2(55. 8) + 3(32. 1) = 207. 9 g/mol 624 g/mol ≈ 3 207. 9 g/mol 3 x Fe 2 S 3 = Fe 6 S 9
![What is the empirical formula for Ibuprofen if the percent composition is 75 7 What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-25.jpg)
What is the empirical formula for Ibuprofen if the percent composition is 75. 7% C, 8. 80% H, and 15. 5% O?
![What is the empirical formula for Ibuprofen if the percent composition is 75 7 What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-26.jpg)
What is the empirical formula for Ibuprofen if the percent composition is 75. 7% C, 8. 80% H, and 15. 5% O? 75. 7 g C 8. 80 g H 15. 5 g O
![What is the empirical formula for Ibuprofen if the percent composition is 75 7 What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-27.jpg)
What is the empirical formula for Ibuprofen if the percent composition is 75. 7% C, 8. 80% H, and 15. 5% O? 75. 7 g C mol C = 6. 31 mol C 12. 0 g C 8. 80 g H mol H = 8. 80 mol H 1. 0 g H 15. 5 g O mol O = 0. 969 mol O 16. 0 g O
![What is the empirical formula for Ibuprofen if the percent composition is 75 7 What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-28.jpg)
What is the empirical formula for Ibuprofen if the percent composition is 75. 7% C, 8. 80% H, and 15. 5% O? 75. 7 g C mol C = 6. 31 mol C 12. 0 g C 6. 31 mol C = 6. 5 C 0. 969 mol 8. 80 g H mol H = 8. 80 mol H 1. 0 g H 8. 80 mol H = 9 H 0. 969 mol 15. 5 g O mol O = 0. 969 mol O 16. 0 g O 0. 969 mol H = 1 O 0. 969 mol
![What is the empirical formula for Ibuprofen if the percent composition is 75 7 What is the empirical formula for Ibuprofen if the percent composition is 75. 7%](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-29.jpg)
What is the empirical formula for Ibuprofen if the percent composition is 75. 7% C, 8. 80% H, and 15. 5% O? 75. 7 g C mol C = 6. 31 mol C 12. 0 g C 6. 31 mol C = 6. 5 C 0. 969 mol 8. 80 g H mol H = 8. 80 mol H 1. 0 g H 8. 80 mol H = 9 H 0. 969 mol 15. 5 g O mol O = 0. 969 mol O 16. 0 g O 0. 969 mol H = 1 O 0. 969 mol C 6. 5 H 9 O x 2 = C 13 H 18 O 2
![What is the molecular formula for Ibuprofen if the molar mass is 206 gmole What is the molecular formula for Ibuprofen if the molar mass is 206 g/mole?](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-30.jpg)
What is the molecular formula for Ibuprofen if the molar mass is 206 g/mole? C 13 H 18 O 2 13(12. 0) + 18(1. 0) + 2(16. 0) = 206 g/mol Therefore the molecular formula is also C 13 H 18 O 2
![Homework Percentage Composition Worksheet due tomorrow Lab Summary Determination of the Empirical Homework • Percentage Composition Worksheet (due tomorrow). • Lab Summary: Determination of the Empirical](https://slidetodoc.com/presentation_image_h/7b0cfa67bfac5bcebda525a373f9f7a5/image-31.jpg)
Homework • Percentage Composition Worksheet (due tomorrow). • Lab Summary: Determination of the Empirical Formula of a Compound (due tomorrow). • Empirical & Molecular Formulas Worksheet – Due in two days
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