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Using molar conversions to determine Empirical and Molecular Formulas

Using molar conversions to determine Empirical and Molecular Formulas. FORMULA OF A COMPOUND BASED ON CHARGES. PREDICTION: WHAT WOULD BE THE FORMULA FOR MAGNESIUM OXIDE?. Formula based on DATA:. Empirical formula : Reduced formula . Ex. CH 2 O

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Using molar conversions to determine Empirical and Molecular Formulas

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  1. Using molar conversions to determine Empirical and Molecular Formulas

  2. FORMULA OF A COMPOUND BASED ON CHARGES • PREDICTION: • WHAT WOULD BE THE FORMULA FOR MAGNESIUM OXIDE?

  3. Formula based on DATA: • Empirical formula: Reduced formula. • Ex. CH2O • Molecular formula: Not reduced formula; must take into account atomic mass! • Ex. C6H12O6 Empirical or Molecular? P2Cl6 PCl5

  4. Application: What is the molecular formula? • A compound has a molecular mass of 132 g/mol and an empirical formula of CH2NO. What is its molecular formula?

  5. How to Find EMPirical Formula • Change % to grams (if the % add up to 100) • Change grams to moles. • Find the mole ratio by dividing by the smallest number. • Change the ratio to a whole # ratio by multiplying by a common multiple. • Use the ratio as the subscripts in the formula.

  6. Find the empirical formula of: • #1 A compound made of magnesium and oxygen that has a total mass of 5 grams and was made by reacting 3 grams of magnesium metal. • #2 A compound made of 75% magnesium and 25% oxygen.

  7. Another empirical formula question • Example Problem #2 • NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O.  Calculate the empirical formula of NutraSweet   (The molar mass of NutraSweet is 294.30 g/mol)

  8. To find molecular formula: • Find the mass of the empirical formula of the molecule. • Divide the mass of the molecular formula weight by the empirical formula: • If they are the same (1): the empirical formula IS the molecular formula. • If they are not the same: multiple each atom in the empirical formula by the number you got when you divided.

  9. Molecular formula of nutrasweet • (The molar mass of NutraSweet is 294.30 g/mol) • What is the molecular formula?

  10. Empirical and molecular Formula • The sample contains 2.143g of carbon and 0.358g of hydrogen. • What is the total molecular weight of this compound? • Find the empirical formula. • Find the mass of the empirical formula. • What is the molecular formula of this compound?

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