Empirical Molecular Formula Chapter 11 12 The Empirical
![Empirical & Molecular Formula Chapter 11 -12 Empirical & Molecular Formula Chapter 11 -12](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-1.jpg)
![The Empirical Formula The lowest whole number ratio of elements in a compound. The The Empirical Formula The lowest whole number ratio of elements in a compound. The](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-2.jpg)
![Finding Empirical Formulas Just find the lowest whole number ratio C 6 H 12 Finding Empirical Formulas Just find the lowest whole number ratio C 6 H 12](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-3.jpg)
![Calculating Empirical Formulas Means we can get ratio from percent composition. Assume you have Calculating Empirical Formulas Means we can get ratio from percent composition. Assume you have](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-4.jpg)
![Example Calculate the empirical formula of a compound composed of 38. 67 % C, Example Calculate the empirical formula of a compound composed of 38. 67 % C,](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-5.jpg)
![Example The ratio is 3. 22 mol C = 1 mol C 3. 22 Example The ratio is 3. 22 mol C = 1 mol C 3. 22](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-6.jpg)
![Your Turn Calculate the empirical formula of a compound composed of 25. 14 % Your Turn Calculate the empirical formula of a compound composed of 25. 14 %](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-7.jpg)
![Empirical to molecular empirical formula = lowest ratio the actual molecule would weigh the Empirical to molecular empirical formula = lowest ratio the actual molecule would weigh the](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-8.jpg)
![Example A compound has an empirical formula of Cl. CH 2 and a molar Example A compound has an empirical formula of Cl. CH 2 and a molar](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-9.jpg)
![Your Turn A compound has an empirical formula of CH 2 O and a Your Turn A compound has an empirical formula of CH 2 O and a](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-10.jpg)
![Percent to molecular Take the percent X the molar mass This gives you mass Percent to molecular Take the percent X the molar mass This gives you mass](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-11.jpg)
![Example Caffeine is 49. 48% C, 5. 15% H, 28. 87% N and 16. Example Caffeine is 49. 48% C, 5. 15% H, 28. 87% N and 16.](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-12.jpg)
![Your Turn Ibuprofen is 75. 69 % C, 8. 80 % H, 15. 51 Your Turn Ibuprofen is 75. 69 % C, 8. 80 % H, 15. 51](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-13.jpg)
- Slides: 13
![Empirical Molecular Formula Chapter 11 12 Empirical & Molecular Formula Chapter 11 -12](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-1.jpg)
Empirical & Molecular Formula Chapter 11 -12
![The Empirical Formula The lowest whole number ratio of elements in a compound The The Empirical Formula The lowest whole number ratio of elements in a compound. The](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-2.jpg)
The Empirical Formula The lowest whole number ratio of elements in a compound. The molecular formula is the actual ratio of elements in a compound. CH 2 empirical formula C 2 H 4 molecular formula C 3 H 6 molecular formula
![Finding Empirical Formulas Just find the lowest whole number ratio C 6 H 12 Finding Empirical Formulas Just find the lowest whole number ratio C 6 H 12](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-3.jpg)
Finding Empirical Formulas Just find the lowest whole number ratio C 6 H 12 O 6 CH 4 N 2 It is not just the ratio of atoms, it is also the ratio of moles of atoms.
![Calculating Empirical Formulas Means we can get ratio from percent composition Assume you have Calculating Empirical Formulas Means we can get ratio from percent composition. Assume you have](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-4.jpg)
Calculating Empirical Formulas Means we can get ratio from percent composition. Assume you have a 100 g. The percentages become grams. Turn grams to moles. Find lowest whole number ratio by dividing everything by the smallest moles.
![Example Calculate the empirical formula of a compound composed of 38 67 C Example Calculate the empirical formula of a compound composed of 38. 67 % C,](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-5.jpg)
Example Calculate the empirical formula of a compound composed of 38. 67 % C, 16. 22 % H, and 45. 11 %N. Assume 100 g so 38. 67 g C x 1 mol C = 3. 22 mole C 12. 0 g. C 16. 22 g H x 1 mol H = 16. 1 mole H 1. 0 g. H 45. 11 g N x 1 mol N = 3. 22 mole N 14. 0 g. N
![Example The ratio is 3 22 mol C 1 mol C 3 22 Example The ratio is 3. 22 mol C = 1 mol C 3. 22](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-6.jpg)
Example The ratio is 3. 22 mol C = 1 mol C 3. 22 mol. N 1 mol N The ratio is 16. 1 mol H = 5 mol H 3. 22 mol. N 1 mol N C 1 H 5 N 1
![Your Turn Calculate the empirical formula of a compound composed of 25 14 Your Turn Calculate the empirical formula of a compound composed of 25. 14 %](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-7.jpg)
Your Turn Calculate the empirical formula of a compound composed of 25. 14 % C, 7. 19 % H, and 67. 67 %N.
![Empirical to molecular empirical formula lowest ratio the actual molecule would weigh the Empirical to molecular empirical formula = lowest ratio the actual molecule would weigh the](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-8.jpg)
Empirical to molecular empirical formula = lowest ratio the actual molecule would weigh the same or more. Divide the actual molar mass by the molar mass of the empirical formula. Get a whole number. Multiply the empirical formula by this.
![Example A compound has an empirical formula of Cl CH 2 and a molar Example A compound has an empirical formula of Cl. CH 2 and a molar](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-9.jpg)
Example A compound has an empirical formula of Cl. CH 2 and a molar mass of 98. 96 g/mol. What is its molecular formula? Cl = 35. 5 g/mol X 1 = 35. 5 g/mol C = 12. 0 g/mol X 1 = 12. 0 g/mol H = 1. 0 g. mol X 2 = 2. 0 g/mol 49. 5 g/mol 98. 96 g/mol ÷ 49. 5 g/mol = 2 2 (Cl. CH 2) = Cl 2 C 2 H 4 Gives us the Molecular Formula
![Your Turn A compound has an empirical formula of CH 2 O and a Your Turn A compound has an empirical formula of CH 2 O and a](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-10.jpg)
Your Turn A compound has an empirical formula of CH 2 O and a molar mass of 180. 0 g/mol. What is its molecular formula?
![Percent to molecular Take the percent X the molar mass This gives you mass Percent to molecular Take the percent X the molar mass This gives you mass](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-11.jpg)
Percent to molecular Take the percent X the molar mass This gives you mass in one mole of the compound Change this to moles You will get whole numbers These are the subscripts
![Example Caffeine is 49 48 C 5 15 H 28 87 N and 16 Example Caffeine is 49. 48% C, 5. 15% H, 28. 87% N and 16.](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-12.jpg)
Example Caffeine is 49. 48% C, 5. 15% H, 28. 87% N and 16. 49% O. It has a molar mass of 194 g. What is its molecular formula? 49. 48% C x 194 g = 5. 15% H x 194 g = 28. 87% N x 194 g = 16. 49% O x 194 g = C 8 H 10 N 4 O 2 96 g ÷ 12. 0 g/mol = 8 10 g ÷ 1. 0 g/mol = 10 56 g ÷ 14. 0 g/mol = 4 32 g ÷ 16. 0 g/mol = 2 Molecular Formula Empirical Formula…. C 4 H 5 N 2 O
![Your Turn Ibuprofen is 75 69 C 8 80 H 15 51 Your Turn Ibuprofen is 75. 69 % C, 8. 80 % H, 15. 51](https://slidetodoc.com/presentation_image/37a021eca134f6a5575e5260a2fb46d9/image-13.jpg)
Your Turn Ibuprofen is 75. 69 % C, 8. 80 % H, 15. 51 % O, and has a molar mass of about 207 g/mol. What is its molecular formula?
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