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Empirical Formula of a Compound

Empirical Formula of a Compound. Molecular Formula (MF). actual formula shows the number of atoms of each element that make up a molecule or a formula unit. Empirical Formula (EF). simplest formula of a compound shows the lowest whole number ratio of the elements in a compound

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Empirical Formula of a Compound

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  1. Empirical Formula of a Compound

  2. Molecular Formula (MF) • actual formula • shows the number of atoms of each element that make up a molecule or a formula unit

  3. Empirical Formula (EF) • simplest formula of a compound • shows the lowest whole number ratio of the elements in a compound • can be determined from the molecular formula or • percentage composition of the compound

  4. Using Molecular Formula- Examples

  5. Using Molecular Formula - Examples

  6. Using Percentage Composition- Examples • Calculate the EF of a compound that is 85.6 % carbon and 14.4 % hydrogen. Answer: Assume that you are using a 100 g sample of the compound and complete the next calculations. Use a table for your data.

  7. Using Percentage Composition- Example #1 Lowest Whole Number

  8. Using Percentage Composition- Example #1 Lowest Whole Number Recall: n = m M

  9. Using Percentage Composition- Example #1 Lowest Whole Number Recall: n = m M

  10. Using Percentage Composition- Example #1 Lowest Whole Number Calculate LWN ratio by dividing: molar amount lowest molar amount

  11. Using Percentage Composition- Example #1 Lowest Whole Number Calculate LWN ratio by dividing: molar amount lowest molar amount

  12. Using Percentage Composition- Example #1 Lowest Whole Number Calculate LWN ratio by dividing: molar amount lowest molar amount

  13. Using Percentage Composition- Example #1 Empirical Formula: CH2

  14. Using Percentage Composition- Examples 2. Calculate the EF of a compound with the following % composition: 32.4 % Na, 22.6 % S and 45.0 % O 3. Calculate the EF of TNT, with the following % composition: 37.0 % C, 2.20 % H, 18.5% N and 42.3 % O

  15. Homework • Text p 273 & 275 • Inv 6B (p 284) Read, answer pre-lab questions and make prediction (Q3)

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