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Situation 1: 3 Boys 3 Girls Lowest Ratio 1:1= BG Empirical formula or molecular?

Situation 1: 3 Boys 3 Girls Lowest Ratio 1:1= BG Empirical formula or molecular? What possible molecular formulas are there? B 3 G 3. Situation 2: 2 Boys 4 Girls Lowest Ratio:1:2= B 1 G 2 Empirical formula or molecular? What possible molecular formulas? B 1 G 2 B 2 G 4.

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Situation 1: 3 Boys 3 Girls Lowest Ratio 1:1= BG Empirical formula or molecular?

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  1. Situation 1: • 3 Boys • 3 Girls • Lowest Ratio 1:1= BG • Empirical formula or molecular? • What possible molecular formulas are there? • B3G3 • Situation 2: • 2Boys • 4Girls • Lowest Ratio:1:2= B1G2 • Empirical formula or molecular? • What possible molecular formulas? • B1G2 • B2G4

  2. Situation 3: We didn’t do this but lets say there were • 25 Girls • 75 Boys • Lowest Ratio: Divide by the lowest number • Girls 25/25=1 • Boys 75/25=3 • B3G1 • Situation 1: • 3 Boys • 3 Girls • Lowest Ratio 1:1= BG • Situation 2: • 3 Boys • 6 Girls • Lowest Ratio:1:2= B1G2

  3. Problem 1 Total • 4000 yellow legos • 2000 black legos • 1200 blue legos • 400 orange legos • Write analogous empirical and molecular formula • YwBkxBuyOz Hint 1: How did you decide on the lowest ratio of Boys to Girls in the people demo?

  4. Problem 1 Total • 4000 yellow legos • 2000 black legos • 1200 blue legos • 400 orange legos • If there were four butterflies, what is the “molecular formula”, aka how many of each colored lego was present in the butterfly. • YwBkxBuyOz

  5. Problem 2: Iclicker: Participation points • The compound sold under the name Prozac is 66.01% C, 5.87% H, 18.43% F, 4.53% N and 5.17% O. What is the empirical formula? • A) C51H54F9N3O3 • B)C34H36F6N2O2 • C) C17H18F3NO • D) None of the above • E) I couldn’t do it

  6. Problem 3: A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. a) Determine the empirical formula of the compound . b) The molar mass was found to be 170.12 g/mol. What is the molecular formula of gallic acid ? c) What would the formula be if the mass was found to be 510 g/mol ?

  7. Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. a) Determine the empirical formula of the compound . Steps/iclicker questions: How many mols of C are present? How many mols of H are present? How many mols of O are present? What is the empirical formul?

  8. Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. b) The molar mass was found to be 170.12 g/mol. What is the molecular formula of gallic acid ? If the empirical formula is C7H6O5. What is the empirical mass?

  9. Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. c) What would the formula be if the mass was found to be 510 g/mol ?

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