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Molecular Formula

Molecular Formula. Agenda Review naming, mole town, formulas Check EF Notes on MF. Review naming. Carbon tetrabromide Tin (II) chloride Carbonic acid Iron (III) acetate Magnesium ion Sulfide. Mole Town. % composition. EF. Cu 2 O CH 2 O CH Fe 2 O 3 CuO. K 2 SO 4 HgO MgCl 2

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Molecular Formula

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  1. Molecular Formula • Agenda • Review naming, mole town, formulas • Check EF • Notes on MF

  2. Review naming • Carbon tetrabromide • Tin (II) chloride • Carbonic acid • Iron (III) acetate • Magnesium ion • Sulfide

  3. Mole Town

  4. % composition

  5. EF

  6. Cu2O CH2O CH Fe2O3 CuO K2SO4 HgO MgCl2 BaCl2 FeS Empirical Formula

  7. Molecular Formula Date:

  8. Molecular Formula • A whole # multiple of the empirical formula • Can be a multiple of one too • EF and MF are the same in this case.

  9. Easiest Method • Multiply MM of MF by percent composition & divide by respective atomic masses. Answer = subscript of MF.

  10. Example A compound is 40% C, 6.7% H and 53.3 % O with a MM of 60. • C: 60 * 0.4 / 12 = 2 • H: 60 * 0.067 /1 = 4 C2H4O2 • O: 60 * 0.533 / 16 = 2 • If EF is desired, reduce ratio of subscripts. CH2O • This MF is a multiple of 2 of the EF

  11. Longer Method – uses procedure learned with EF

  12. A compound is 40% C, 6.7% H and 53.3 % O with a MM of 60. Step 1 C: 40/12 = 3.3 = 1 H: 6.7/1 = 6.7 divide by 3.3 = 2 O: 53.3/16 = 3.3 = 1 EF: CH2O

  13. Step 2 • Find molar mass of EF. 30 • Step 3 • Divide molar mass of MF by EF to get multiple. 60/30 = 2 • Step 4 • Multiply subscripts of EF by multiple to get MF. C2H4O2

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